Floundering with network connections

I have a G5 iMac, link-sys wireless-G ASDL gate way connected by ethernet, and my mum has a G4 iBook with airport extreme.
Before we were able to connect up mums iBook to my internet connection with no problems, as she only visits a few times a year.
However tonight, no luck. I've been back and tried re setting up her airport connection, which says its connected to the network, however she can not open any pages in safari or access her email. After two hours of messing around by my sister and I we are completely stumped. The computer says its connected, and I ve taken off all security setting from the router, still no internet. Although this is not urgent, or really necessary, it become a niggle! can any one help?
( sorry if my explanations all a bit vague - I have a mac so that I don't need to worry about this stuff!)

On the Mac, go to System Preferences->Network. Choose Automatic as the location. From the Show menu, choose Network Port Configurations. In the list that shows up, make sure there is a checkbox next to Airport. Click on Airport, then drag it to the top of the list. Apply settings.
Then take a look in System Preferences->Network->Show Airport. Click on the TCP/IP tab, and make sure the only selection is to "configure using DHCP". While there, note what IP address is listed (should be of the form 192.168.1.x) and tell us what it is.

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(Mod note: edited for guidelines compliance)

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Dear all,
laptop:: Lenovo X61s 3G L7700
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WinBug analysis:
Microsoft (R) Windows Debugger Version 6.9.0003.113 X86
Copyright (c) Microsoft Corporation. All rights reserved.
Loading Dump File [C:\Users\vincentyip\Desktop\Mini011709-09.dmp]
Mini Kernel Dump File: Only registers and stack trace are available
Symbol search path is: SRV*c:\symbols*http://msdl.microsoft.com/download/symbols
Executable search path is:
Windows Server 2008 Kernel Version 6001 (Service Pack 1) MP (2 procs) Free x86 compatible
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 6001.18145.x86fre.vistasp1_gdr.080917-1612
Kernel base = 0x8200b000 PsLoadedModuleList = 0x82122c70
Debug session time: Sat Jan 17 21:04:50.693 2009 (GMT+0)
System Uptime: 0 days 0:08:18.357
Loading Kernel Symbols
Loading User Symbols
Loading unloaded module list
*                        Bugcheck Analysis                                    *
Use !analyze -v to get detailed debugging information.
BugCheck 1000007F, {8, 803d3130, 0, 0}
Unable to load image dne2000.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for dne2000.sys
*** ERROR: Module load completed but symbols could not be loaded for dne2000.sys
Unable to load image Epfwndis.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for Epfwndis.sys
*** ERROR: Module load completed but symbols could not be loaded for Epfwndis.sys
*** WARNING: Unable to verify timestamp for epfw.sys
*** ERROR: Module load completed but symbols could not be loaded for epfw.sys
Probably caused by : tcpip.sys ( tcpip!WfpAuditEventGeneral+1cb )
Followup: MachineOwner
1: kd> !analyze -v
*                        Bugcheck Analysis                                    *
UNEXPECTED_KERNEL_MODE_TRAP_M (1000007f)
This means a trap occurred in kernel mode, and it's a trap of a kind
that the kernel isn't allowed to have/catch (bound trap) or that
is always instant death (double fault). The first number in the
bugcheck params is the number of the trap (8 = double fault, etc)
Consult an Intel x86 family manual to learn more about what these
traps are. Here is a *portion* of those codes:
If kv shows a taskGate
        use .tss on the part before the colon, then kv.
Else if kv shows a trapframe
        use .trap on that value
Else
        .trap on the appropriate frame will show where the trap was taken
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Endif
kb will then show the corrected stack.
Arguments:
Arg1: 00000008, EXCEPTION_DOUBLE_FAULT
Arg2: 803d3130
Arg3: 00000000
Arg4: 00000000
Debugging Details:
BUGCHECK_STR: 0x7f_8
CUSTOMER_CRASH_COUNT: 9
DEFAULT_BUCKET_ID: COMMON_SYSTEM_FAULT
PROCESS_NAME: System
CURRENT_IRQL: 2
LAST_CONTROL_TRANSFER: from 8a67c8da to 8203f6c0
STACK_TEXT:
8cf21274 8a67c8da 00000000 8cf21534 00000000 nt!SeReportSecurityEventWithSubCategory+0xe
8cf2154c 8a67cb3f 00003900 8cf216dc 8a67696d tcpip!WfpAuditEventGeneral+0x1cb
8cf21558 8a67696d 8cf21588 00000000 8cf21848 tcpip!KfdAuditEvent+0x38
8cf216dc 8a676709 0000001c 8cf219e0 8cf21848 tcpip!IndicateDropAudit+0x1ac
8cf217e0 8a67cddb 0000001c 0000001d 8cf219e0 tcpip!ShimIndicateDiscard+0x3e
8cf2181c 8a63025b 0000001c 8cf219e0 8cf21848 tcpip!ShimIndicateDiscardGeneral+0x50
8cf219f0 8a696833 00000011 00008900 00008900 tcpip!WfpInspectReceiveControlShimV4+0x2fb
8cf21a80 8a679a9f 00000002 86a52dc0 869ca000 tcpip!ProcessIcmpErrorClassify+0x1cf
8cf21d0c 8a67cf6f 00000001 00000002 00000000 tcpip!WfpProcessInTransportStackIndication+0xe1
8cf21d60 8a618e27 86a52dc0 00000002 00000001 tcpip!InetInspectReceiveDatagram+0xce
8cf21d94 8a618c2e 869d2668 b6aad4c8 a8396220 tcpip!RawBeginMessageIndication+0x35
8cf21de8 8a67657e 869d2668 00000002 00000000 tcpip!RawDeliverDatagrams+0xf9
8cf21e28 8a676105 869d2668 00000000 8cf21e64 tcpip!RawReceiveDatagrams+0x10d
8cf21e38 8a67402b 8cf21e4c c000023e 00000000 tcpip!RawNlClientReceiveDatagrams+0x12
8cf21e64 8a673dee 8a6cd19c 8cf21ec0 c000023e tcpip!IppDeliverListToProtocol+0x49
8cf21e84 8a673d34 8a6cac68 00000101 8cf21ec0 tcpip!IppProcessDeliverList+0x2a
8cf21edc 8a6734ec 8a6cac68 00000001 00000000 tcpip!IppReceiveHeaderBatch+0x20a
8cf21f6c 8a671fe6 879b6c90 00000000 820ee401 tcpip!IpFlcReceivePackets+0xbe1
8cf21fe8 8a67252e 89dfbbe8 89d16bf0 00000000 tcpip!FlpReceiveNonPreValidatedNetBufferListChain+0x6e3
8cf22010 8a5400b0 89dfbbe8 89d16bf0 00000000 tcpip!FlReceiveNetBufferListChain+0x104
8cf22044 8a532919 00dfb830 89d16bf0 00000000 ndis!ndisMIndicateNetBufferListsToOpen+0xab
8cf2206c 8a532890 00000000 00000001 87c840e8 ndis!ndisIndicateSortedNetBufferLists+0x4a
8cf221e8 8a47357f 87c840e8 00000000 00000000 ndis!ndisMDispatchReceiveNetBufferLists+0x129
8cf22204 8a5452ba 87c840e8 89d16bf0 00000000 ndis!ndisMTopReceiveNetBufferLists+0x2c
8cf22250 8a53fba0 02c840e8 8cf22294 00000001 ndis!ndisMIndicatePacketsToNetBufferLists+0xe9
8cf2228c 8a565bfc 85756ef8 8796aa54 89dd87c4 ndis!ndisLWM5IndicateReceive+0x31d
8cf222b0 8df0e67a 879b6d10 8796aa54 89dd87c4 ndis!EthIndicateReceive+0x1f
WARNING: Stack unwind information not available. Following frames may be wrong.
8cf22334 8deffa73 89df7020 89dd8778 89dd87c4 dne2000+0x1767a
8cf22360 8a565570 89df7020 89dd8778 89dd87c4 dne2000+0x8a73
8cf223d0 8ebe5f49 c000009a 8cf22400 00000001 ndis!ethFilterDprIndicateReceivePacket+0x2fc
8cf223f8 8ebe6f3b 89dd8778 00000000 87c99008 Epfwndis+0x2f49
8cf2243c 8ebe49cb 830020cc 89b582d8 00000008 Epfwndis+0x3f3b
8cf22488 8a5487fe 87bc3b80 87434d60 87bc3c38 Epfwndis+0x19cb
8cf224a4 8a548938 87bc3b80 87434d60 00000000 ndis!ndisDummyIrpHandler+0x72
8cf22594 820c6fd3 87bc3b80 87434d60 875ac9a8 ndis!ndisDeviceControlIrpHandler+0xe4
8cf225ac 8fd91011 89b0cbdc 875ac9a8 00000000 nt!IofCallDriver+0x63
8cf225d4 8fd91148 875ac9a8 875acffe 89b582d8 epfw+0x7011
8cf225ec 8fd8b1cb 89b0cbdc 8fd99924 830020cc epfw+0x7148
8cf2262c 8fd91bf3 89b0cb18 89b582d8 84e99264 epfw+0x11cb
8cf22640 8fd946a7 89b0cb18 89b582d8 84e99264 epfw+0x7bf3
8cf2268c 8a5a980a 86992548 00000089 876cf3d8 epfw+0xa6a7
8cf227f8 89b9af4e 0000044c 89b0cb18 89b582d8 NETIO!PopulateContext+0x2f
8cf228d0 8a5aa7a4 00000000 89b1bb6d 00002711 0x89b9af4e
8cf22964 8a5ae5ed 8a5d3324 8cf229e4 00000000 NETIO!MatchCondition+0x4b
8cf229ac 823cb5b0 876cf3b8 84916500 00000000 NETIO!KfdAleAcquireEndpointContextFromFlow+0x82
8cf229bc 8cf22a18 876cf3f8 8cf229e8 8a5ae3f7 hal!KfLowerIrql+0x64
00000000 00000000 00000000 00000000 00000000 0x8cf22a18
STACK_COMMAND: kb
FOLLOWUP_IP:
tcpip!WfpAuditEventGeneral+1cb
8a67c8da 5b              pop     ebx
SYMBOL_STACK_INDEX: 1
SYMBOL_NAME: tcpip!WfpAuditEventGeneral+1cb
FOLLOWUP_NAME: MachineOwner
MODULE_NAME: tcpip
IMAGE_NAME: tcpip.sys
DEBUG_FLR_IMAGE_TIMESTAMP: 4812c4ce
FAILURE_BUCKET_ID: 0x7f_8_tcpip!WfpAuditEventGeneral+1cb
BUCKET_ID: 0x7f_8_tcpip!WfpAuditEventGeneral+1cb
Followup: MachineOwner

Per my original post:
"When my ATV is connected via ethernet, and I attempt to play some internet radio stations, some will work just fine while others won't. For example, when connected to my home network via ethernet, some internet radio channels (I can't give a percentage because I haven't tested all of them) will play just fine, however, others won't. The ATV will attempt to connect, but the spinning progress bar just goes and goes and goes until it eventually errors out (no error number is provided, it just says that there was trouble loading the content). The funny thing (or not so funny thing actually) is that if I unplug the ethernet cable, and connect my ATV to the network via wifi, those same stations that didn't play when ATV was connected via ethernet, WILL play when ATV is connected via wifi. So, in short, some stations play just fine when ATV is connected to home network, through wireless router, via either wifi OR ethernet, yet some will only play when ATV is connected to home network via wifi. I have found this to be the same when it comes to downloading or refreshing the photos in my photo stream. If I throw new photos in my photo stream on iCloud, and the ATV is connected via ethernet, they won't refresh to the ATV, however, if I unplug the ATV and connect via wifi they begin to refresh."
There are dozens of original threads out there that report of similar - if not exact, issues. I have contacted "Roy" per his request and not heard back from him (if such a person exists). I have "restored" my ATV and rebooted all equipment to no avail. Until Apple gets with it, acknowledges their problem, and fixes it, I am resigned to just having to deal with switching back and forth from wifi to ethernet, and so on.

Floundering with network connections

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