Does the second error occur when you attempt to do a System Restore?
If so, this article may apply:
http://articles.techrepublic.com.com/5100-1035_11-5225409.html
Do not follow the article's recommendations unless you are unable to perform a System Restore as it will delete all currently available restore points.
If you can, I would first try to perform a XP System Restore to a date prior to when the issue first started occurring. (Start - All Programs - Accessories - System Tools - System Restore). This can also be done in Safe Mode.
The reference memory error may be related to a bad RAM module or a trojan virus.
To perform a full RAM test use MemTest86:
(http://www.memtest.org/).
It may take over four hours to complete the test.
Use the boot CD option to run it.
Then IF that test does not turn up any problems, use AVG (http://tinyurl.com/fky54) or your own anti-virus program, with the latest virus definitions, perform a full system scan in Safe Mode. You can also use McAfee Stinger (http://tinyurl.com/1x4v).
Here is a good free on-line scan offered by BitDefender: http://tinyurl.com/aauh5 .
And another by TrendMicro: http://tinyurl.com/2xis .
I would also use this tool: RootKitRevealer (http://tinyurl.com/y3hgq9)
or AVG's free RootKit detector and Remover: (http://tinyurl.com/35jq2t)
If you determine that there is indeed a virus involved,
I recommend you go here:
http://tinyurl.com/hnsvd .
TrendMicro has always been my favorite source for virus information and removal.
My second choice would be BitDefender. Here's a link to their extensive library of free removal tools:
http://tinyurl.com/y6opnp
Please let me know what resolves your issue.
Good Luck
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