Problem loading certain websites

For the past year or so, my iMac has (running Mac OS X 10.5.8) has been giving me trouble when it comes to loading certain websites. The reason why I think it's my computer as opposed to my browser or my internet connection is because these websites will load on other computers connected to the wireless network in my home, and because the problem persists with any browser I attempt to use - I've tried Google Chrome, Firefox and Safari and none of them load these websites. (Also, they load fine when I'm on the internet via my iPod touch.)
The websites in question include about.com, ehow.com, and any website with a .me extension. There are others, but those are the three that come to mind at the moment. When I try to go on about.com for example, the page simply does not load. There's not even an attempt to load the page. It's very frustrating because I see no reason why these websites shouldn't work.
I have tried clearing the caches, history and preferences for all browsers, as well as logging in as a different user on my computer and seeing if these websites worked - they didn't work, even as a different user. I was told it could be a problem with the .plist files, so I dragged all of them into the trash and tried loading these webpages, but it still didn't work. Does anyone know what else it could be? Also, I apologize if my description of the problem was unclear.

Some other things you can try:
1. Run Software Update (in the Apple Menu) and make sure you have all available Apple updates for OS X.
2. Go to Adobe.com and make sure you have the latest versions of Shockwave and Flash for your computer installed.
3. Go to System Preferences > Parental Controls and see if any restrictions have been established.
4. Go to System Preferences > Accounts and set up a new user account. Try using your browsers from this account. If they work, there is a problem with your "old" account. Next steps will depend on how much time and effort you're willing to devote to troubleshooting.
5. Power cycle your router and computer.
6. Go to System Preferences > Network. Highlight your router (assuming you're using a wireless connection) and select the "TCP/IP" panel. Click on the "Renew DHCP Lease" button.
Message was edited by: inandoutofgrace

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Current configuration : 9006 bytes
version 15.3
no service pad
service timestamps debug datetime msec localtime
service timestamps log datetime msec localtime
service password-encryption
hostname R-US-RS-WVPN1
boot-start-marker
boot system flash:c1900-universalk9-mz.SPA.153-1.T1.bin
boot system flash:c1900-universalk9-mz.SPA.151-3.T1.bin
boot-end-marker
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no aaa new-model
clock timezone CET 1 0
clock summer-time CET recurring last Sun Mar 2:00 last Sun Oct 3:00
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errdisable recovery cause bpduguard
errdisable recovery cause rootguard
errdisable recovery cause pagp-flap
errdisable recovery cause dtp-flap
errdisable recovery cause link-flap
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ip cef
ip domain name corp.com
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ip name-server 10.###.8.96
ip inspect dns-timeout 90
ip inspect tcp idle-time 60
ip inspect name fw smtp timeout 120
ip inspect name fw ftp timeout 120
ip inspect name fw realaudio
ip inspect name fw tftp timeout 30
ip inspect name fw udp timeout 30
ip inspect name fw tcp timeout 60
no ipv6 cef
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crypto pki trustpoint TP-self-signed-316595902
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-316595902
revocation-check none
rsakeypair TP-self-signed-316595902
crypto pki certificate chain TP-self-signed-316595902
certificate self-signed 01
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license udi pid CISCO1921/K9 sn FTX153182M8
spanning-tree vlan 229 priority 8192
redundancy
ip ssh version 2
crypto isakmp policy 10
hash md5
authentication pre-share
lifetime 3600
crypto isakmp key *removed* address 70.###.172.142
crypto isakmp key *removed* address 184.###.###.254
crypto isakmp keepalive 35 11
crypto ipsec transform-set FY-WVPN-Tunnel esp-aes esp-md5-hmac
mode tunnel
crypto map vpn 10 ipsec-isakmp
set peer 70.###.172.142
set peer 184.###.###.254
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interface Loopback0
ip address 10.###.0.10 255.255.255.255
interface Tunnel2291
description Primary-TimewarnerTelecom-Ral-FayWVPN1
ip address 10.###.99.26 255.255.255.252
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tunnel source 66.###.161.126
tunnel destination 184.###.###.254
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interface Tunnel2293
description Primary-TimewarnerTelecom-Ral-FayWVPN2
ip address 10.###.99.154 255.255.255.252
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tunnel source 66.###.161.126
tunnel destination 70.###.172.142
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interface GigabitEthernet0/0
description TW Telecom/DMVPN1
ip address 66.###.161.126 255.255.255.252
ip access-group Block-Internet in
ip access-group Block-Internet out
duplex auto
speed auto
no cdp enable
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duplex auto
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switchport access vlan 229
no ip address
interface GigabitEthernet0/0/1
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/2
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/3
description PBX Eth1
switchport access vlan 229
no ip address
interface Vlan1
no ip address
shutdown
interface Vlan229
ip address 10.###.229.253 255.255.255.0
ip helper-address 10.###.231.201
standby 229 ip 10.###.229.254
standby 229 priority 105
standby 229 preempt
router eigrp 100
network 10.0.0.0
ip forward-protocol nd
no ip http server
ip http secure-server
ip route 70.###.172.142 255.255.255.255 66.###.161.125
ip route 184.###.###.254 255.255.255.255 66.###.161.125
ip route 205.###.96.180 255.255.255.252 66.###.161.125
ip access-list extended Block-Internet
permit esp host 66.###.161.126 host 184.###.###.254
permit esp host 184.###.###.254 host 66.###.161.126
permit udp host 66.###.161.126 host 184.###.###.254 eq isakmp
permit udp host 184.###.###.254 host 66.###.161.126 eq isakmp
permit esp host 66.###.161.126 host 70.###.172.142
permit esp host 70.###.172.142 host 66.###.161.126
permit udp host 66.###.161.126 host 70.###.172.142 eq isakmp
permit udp host 70.###.172.142 host 66.###.161.126 eq isakmp
permit icmp host 66.###.161.126 host 184.###.###.254
permit icmp host 184.###.###.254 host 66.###.161.126
permit icmp host 66.###.161.126 host 70.###.172.142
permit icmp host 70.###.172.142 host 66.###.161.126
permit icmp any any echo-reply
permit icmp any any time-exceeded
permit icmp any any packet-too-big
permit icmp any any traceroute
permit icmp any any unreachable
deny   ip any any
deny   icmp any any
ip access-list extended gre-tunnel-list
permit gre host 66.###.161.126 host 184.###.###.254
permit gre host 66.###.161.126 host 70.###.172.142
logging host 10.100.###.254
logging host 10.100.###.246
snmp-server community a RW 20
snmp-server community r RO 20
snmp-server community a RW 20
snmp-server community r RO 20
snmp-server community P_RW RW
snmp-server community P_RO RO
snmp-server enable traps entity-sensor threshold
snmp-server host 10.100.###.246 public
snmp-server host 10.100.###.254 public
access-list 20 permit 10.###.9.3
access-list 20 permit 10.###.8.16
access-list 20 permit 10.100.###.249
access-list 20 permit 10.100.###.254
access-list 20 permit 10.100.###.246
control-plane
banner motd ^CCCCCCC
****************** Warning! Warning! Warning! ********************
This system is restricted to authorized users for business
purposes. Unauthorized access is a violation of the law. This
service may be monitored for administrative and security reasons.
By proceeding, you consent to this monitoring
****************** Warning! Warning! Warning! ********************
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line con 0
login local
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
exec-timeout 60 0
password 7 *removed*
login local
transport input ssh
line vty 5 15
exec-timeout 60 0
password 7 *removed*
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transport input ssh
scheduler allocate 20000 1000
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ntp server 10.###.231.200 prefer
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ntp server 10.###.1.6 prefer
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Router 2
Current configuration : 9013 bytes
version 15.3
no service pad
service timestamps debug datetime msec localtime
service timestamps log datetime msec localtime
service password-encryption
hostname R-US-RS-WVPN2
boot-start-marker
boot system flash:c1900-universalk9-mz.SPA.153-1.T1.bin
boot system flash:c1900-universalk9-mz.SPA.151-3.T1.bin
boot-end-marker
logging buffered 64000
logging console critical
enable secret 5 *removed*
no aaa new-model
clock timezone CET 1 0
clock summer-time CET recurring last Sun Mar 2:00 last Sun Oct 3:00
errdisable recovery cause udld
errdisable recovery cause bpduguard
errdisable recovery cause rootguard
errdisable recovery cause pagp-flap
errdisable recovery cause dtp-flap
errdisable recovery cause link-flap
errdisable recovery interval 303
ip cef
ip domain name corp.mann-hummel.com
ip name-server 10.###.8.21
ip name-server 10.###.8.96
ip inspect dns-timeout 90
ip inspect tcp idle-time 60
ip inspect name fw smtp timeout 120
ip inspect name fw ftp timeout 120
ip inspect name fw realaudio
ip inspect name fw tftp timeout 30
ip inspect name fw udp timeout 30
ip inspect name fw tcp timeout 60
ipv6 multicast rpf use-bgp
no ipv6 cef
multilink bundle-name authenticated
crypto pki trustpoint TP-self-signed-3179596086
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-3179596086
revocation-check none
rsakeypair TP-self-signed-3179596086
crypto pki certificate chain TP-self-signed-3179596086
certificate self-signed 01
*removed*
        quit
license udi pid CISCO1921/K9 sn FTX153182M2
spanning-tree vlan 229 priority 1###84
redundancy
ip ssh version 2
crypto isakmp policy 10
hash md5
authentication pre-share
lifetime 3600
crypto isakmp key *removed* address 70.###.172.142
crypto isakmp key *removed* address 184.###.###.254
crypto isakmp keepalive 35 11
crypto ipsec transform-set Fay-Ral-WVPN-Tunnel esp-aes esp-md5-hmac
mode tunnel
crypto map vpn 10 ipsec-isakmp
set peer 184.###.###.254
set peer 70.###.172.142
set transform-set Fay-Ral-WVPN-Tunnel
match address gre-tunnel-list
interface Loopback0
ip address 10.###.0.12 255.255.255.255
interface Tunnel2292
description Failover-TimewarnerCable-Ral-Fay-WVPN2
ip address 10.###.99.30 255.255.255.252
no ip redirects
cdp enable
tunnel source 96.###.25.226
tunnel destination 184.###.###.254
crypto map vpn
interface Tunnel2294
description Failover-TimewarnerCable-Ral-Fay-WVPN2
ip address 10.###.99.158 255.255.255.252
no ip redirects
cdp enable
tunnel source 96.###.25.226
tunnel destination 70.###.172.142
crypto map vpn
interface Embedded-Service-Engine0/0
no ip address
shutdown
interface GigabitEthernet0/0
description Fay-Ral WVPN
ip address 96.###.25.226 255.255.255.252
ip access-group Block-Internet in
ip access-group Block-Internet out
duplex auto
speed auto
no cdp enable
crypto map vpn
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
interface GigabitEthernet0/0/0
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/1
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/2
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/3
description PBX Eth2
switchport access vlan 229
no ip address
interface Vlan1
no ip address
shutdown
interface Vlan229
ip address 10.###.229.252 255.255.255.0
ip helper-address 10.###.231.201
standby 229 ip 10.###.229.254
standby 229 preempt
router eigrp 100
network 10.0.0.0
ip forward-protocol nd
no ip http server
ip http secure-server
ip route 70.###.172.142 255.255.255.255 96.###.25.225
ip route 184.###.###.254 255.255.255.255 96.###.25.225
ip route 205.###.96.180 255.255.255.252 66.###.161.125
ip access-list extended Block-Internet
permit esp host 96.###.25.226 host 184.###.###.254
permit esp host 184.###.###.254 host 96.###.25.226
permit udp host 96.###.25.226 host 184.###.###.254 eq isakmp
permit udp host 184.###.###.254 host 96.###.25.226 eq isakmp
permit esp host 96.###.25.226 host 70.###.172.142
permit esp host 70.###.172.142 host 96.###.25.226
permit udp host 96.###.25.226 host 70.###.172.142 eq isakmp
permit udp host 70.###.172.142 host 96.###.25.226 eq isakmp
permit icmp host 96.###.25.226 host 184.###.###.254
permit icmp host 184.###.###.254 host 96.###.25.226
permit icmp host 96.###.25.226 host 70.###.172.142
permit icmp host 70.###.172.142 host 96.###.25.226
permit icmp any any echo-reply
permit icmp any any time-exceeded
permit icmp any any packet-too-big
permit icmp any any traceroute
permit icmp any any unreachable
deny   ip any any
deny   icmp any any
ip access-list extended gre-tunnel-list
permit gre host 96.###.25.226 host 184.###.###.254
permit gre host 96.###.25.226 host 70.###.172.142
logging host 10.100.###.254
logging host 10.100.###.246
snmp-server community P_RW RW
snmp-server community P_RO RO
snmp-server community a RW 20
snmp-server community r RO 20
snmp-server community a RW 20
snmp-server community r RO 20
snmp-server enable traps entity-sensor threshold
snmp-server host 10.100.###.246 public
snmp-server host 10.100.###.254 public
access-list 20 permit 10.###.9.3
access-list 20 permit 10.###.8.16
access-list 20 permit 10.100.###.249
access-list 20 permit 10.100.###.254
access-list 20 permit 10.100.###.246
control-plane
banner motd ^CCCCCC
****************** Warning! Warning! Warning! ********************
This system is restricted to authorized users for business
purposes. Unauthorized access is a violation of the law. This
service may be monitored for administrative and security reasons.
By proceeding, you consent to this monitoring
****************** Warning! Warning! Warning! ********************
^C
line con 0
login local
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
exec-timeout 60 0
password 7 *removed*
login local
transport input ssh
line vty 5 15
exec-timeout 60 0
password 7 *removed*
login local
transport input ssh
scheduler allocate 20000 1000
ntp server 10.###.8.8 prefer
ntp server 10.###.231.200 prefer
ntp server 10.###.8.69
ntp server 10.###.1.6 prefer
end

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