Hi and welcome to TSG.
Best to wait until a Hjt log expert checks your log in your other post.
They may well spot something.
Or try a Repair install.
Insert the XP cd in the CD ROM Drive then switch on the computer.
You will receive the following message:
This portion of the Setup program prepares Microsoft Windows XP to run on your computer:
To setup Windows XP now, press ENTER.
To repair a Windows XP installation using Recovery Console, press R.
To quit Setup without installing Windows XP, press F3.
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DO NOT at this point select R.... DO NOT SELECT R
Select ENTER
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On the Windows XP Licensing Agreement screen
Press F8 to agree to the license agreement
Select current installation of Windows XP.and then
Press R to repair Windows XP.
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Follow the instructions that appear on the screen to repair Windows.
After you repair Windows , you may have to reactivate your copy of Windows XP
http://www.michaelstevenstech.com/XPrepairinstall.htm