Xp blue screen error

First I would take out the new ram to see if maybe that is causing a problem.

Here is what Microsoft has to say about it:

http://tinyurl.com/5snx4

Other Link that might help:

http://tinyurl.com/5n7fa

I have a feeling that you have a bad Ram chip.

I have often seen this problem when there is a problem with the hard drive. I would go to the manufacturer's website and see if they have some advanced diagnostics for it. Otherwise try the hitachi Hard Drive Fitness Test. Some options wont work on a non Hitachi drive but it is rated to do most things on most drives.

http://www.hitachigst.com/hdd/support/download.htm#DFT

Windows XP keeps a special log of all BSoD errors, called a Watchdog Event Log. Unlike a memory dump, whose creation is the result of a BSoD error, a Watchdog Event Log is a straight text file that is easier to read and understand. This should help confirm what is really causing the problem.

Here's how you access a Watchdog Event Log:

1. Use Windows Explorer to access the C:\Windows\LogFiles\Watchdog folder.
2. Locate and right-click the most recently dated .WDL file.
3. Select the Open command from the context menu.
4. In the Windows dialog box, choose the Select The Program From A List option and click OK.
5. When you see the Open With dialog box, select Notepad and click OK

That most definitely sounds like a memory fault, as such errors tend to show up more reliably in windows xp than in Windows98. I'd replace the new ram with other chips.