Programs not installing - invalid checksum and errors

I have tried installing a few programs recently and they download, but then when I click to install them it says invalid checksum.
The programs I have tried are Adobe reader and a Safari update. I tried downloading Adobe reader about 6 times on different days and the same error occurred. Of course both are reputable programs.
Last night I tried to download Apple Software Updates which were over 2gb and took 10 hours to download. They produced an error report saying that there was a file error and try again...... of course im not happy because that chewed up a lot of my internet limit and took forever
Does anyone have any solutions to these installation errors?

http://support.apple.com/kb/HT2041

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Solved!
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Hi there!
Yes, same problem too; I've already sent an email to apple support and just received a very vague and unpractical response with "call apple support in your country" as main advice. I've obviously emailed back stating that I need a clearer response and I don not have any intention to spend money calling for support when updates is a free tool. I do also believe this is a probem generated on Apple's end, I just wish they learned to say "sorry, it's us; working on it!"
Message was edited by: MacLuc

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Microsoft Windows 7 x64 Ultimate Edition Service Pack 1 (Build 7601)
Sony Corporation VGN-SR520G
iTunes 11.0.4.4
QuickTime 7.7.2
FairPlay 2.4.14
Apple Application Support 2.3.4
iPod Updater Library 10.0d2
CD Driver Not Available
CD Driver DLL 2.1.3.1
Apple Mobile Device 6.1.0.13
Apple Mobile Device Driver 1.64.0.0
Bonjour 3.0.0.10 (333.10)
Gracenote SDK 1.9.6.502
Gracenote MusicID 1.9.6.115
Gracenote Submit 1.9.6.143
Gracenote DSP 1.9.6.45
iTunes Serial Number 0037BDB8096213E8
Current user is not an administrator.
The current local date and time is 2013-08-06 15:49:16.
iTunes is not running in safe mode.
WebKit accelerated compositing is enabled.
HDCP is supported.
Core Media is supported.
Video Display Information
Intel Corporation, Mobile Intel(R) 4 Series Express Chipset Family
Intel Corporation, Mobile Intel(R) 4 Series Express Chipset Family
**** External Plug-ins Information ****
No external plug-ins installed.
Genius ID: bacbfef65266ce1f14880911ab02cf41
**** Network Connectivity Tests ****
Network Adapter Information
Adapter Name:    {18D4A6E8-F45A-4F28-9AD0-F9C8D88563EA}
Description:    Bluetooth Device (Personal Area Network)
IP Address:    0.0.0.0
Subnet Mask:    0.0.0.0
Default Gateway:    0.0.0.0
DHCP Enabled:    Yes
DHCP Server:
Lease Obtained:    Wed Dec 31 16:00:00 1969
Lease Expires:    Wed Dec 31 16:00:00 1969
DNS Servers:
Adapter Name:    {0FDB6DF3-7F90-400A-88BB-35067E7A6DE7}
Description:    Intel(R) WiFi Link 5100 AGN
IP Address:    192.168.0.7
Subnet Mask:    255.255.255.0
Default Gateway:    192.168.0.1
DHCP Enabled:    Yes
DHCP Server:    192.168.0.1
Lease Obtained:    Tue Aug 06 15:37:23 2013
Lease Expires:    Tue Aug 06 16:37:23 2013
DNS Servers:    71.9.127.107
        68.190.192.35
        24.205.224.36
Adapter Name:    {9E496D44-0552-48DF-AF8E-708D23F5BA00}
Description:    Marvell Yukon 88E8040 PCI-E Fast Ethernet Controller
IP Address:    0.0.0.0
Subnet Mask:    0.0.0.0
Default Gateway:    0.0.0.0
DHCP Enabled:    Yes
DHCP Server:
Lease Obtained:    Wed Dec 31 16:00:00 1969
Lease Expires:    Wed Dec 31 16:00:00 1969
DNS Servers:
Active Connection:    LAN Connection
Connected:    Yes
Online:        Yes
Using Modem:    No
Using LAN:    Yes
Using Proxy:    No
Firewall Information
Windows Firewall is on.
iTunes is NOT enabled in Windows Firewall.
Connection attempt to Apple web site was successful.
Connection attempt to browsing iTunes Store was successful.
Connection attempt to purchasing from iTunes Store was successful.
Connection attempt to iPhone activation server was successful.
Connection attempt to firmware update server was successful.
Connection attempt to Gracenote server was successful.
Last successful iTunes Store access was 2013-08-06 15:48:50.
**** Device Connectivity Tests ****
iPodService 11.0.4.4 (x64) is currently running.
iTunesHelper 11.0.4.4 is currently running.
Apple Mobile Device service 3.3.0.0 is currently running.
Universal Serial Bus Controllers:
Intel(R) ICH9 Family USB Universal Host Controller - 2934. Device is working properly.
Intel(R) ICH9 Family USB Universal Host Controller - 2935. Device is working properly.
Intel(R) ICH9 Family USB Universal Host Controller - 2936. Device is working properly.
Intel(R) ICH9 Family USB Universal Host Controller - 2937. Device is working properly.
Intel(R) ICH9 Family USB Universal Host Controller - 2938. Device is working properly.
Intel(R) ICH9 Family USB Universal Host Controller - 2939. Device is working properly.
Intel(R) ICH9 Family USB2 Enhanced Host Controller - 293A. Device is working properly.
Intel(R) ICH9 Family USB2 Enhanced Host Controller - 293C. Device is working properly.
FireWire (IEEE 1394) Host Controllers:
Ricoh 1394 OHCI Compliant Host Controller. Device is working properly.
Most Recent Devices Not Currently Connected:
iPod touch (4th generation) running firmware version 6.1.3
Serial Number:
iPhone 5 (CDMA) running firmware version 6.1.4
Serial Number:
iPad 2 running firmware version 6.1.3
Serial Number:
**** Device Sync Tests ****
No iPod, iPhone, or iPad found.

Hello Craz4Sk8erGuy
If you uninstall iTunes, you will not lose any data if you uninstall iTunes, the iTunes database file will not be removed. Check out the article below on how to completely uninstall iTunes and its associating services. Also, I found an article for burning issues with Sony burners as well.
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/HT1923
Burning disc in iTunes for Windows using a Sony CD-RW/DVD CRX830E model drive fails with 4280 error
http://support.apple.com/kb/ta38101
Thanks for using Apple Support Communities.
Regards,
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