MSE svc disabled repeatedly during scan

Good evening, and thank you so much for taking the time to read this!

MSE: During scan receive error that service was disabled and can be re-enabled manually or by rebooting. Happens at random points in scan.

Previously ran Mbam - Removed 7 files, 2 classified as vundo trojans. Mbam executable had to be renamed to get it to successfully update definitions without errors.

Booted into safemode and ran scan, halfway through received a page_fault_in_nonpaged_area bsod.

Unsure what other info you may need from me.

I'm having some issues with an older computer I've just resurrected from my mother's closet and am concerned that I'm potentially dealing with a nasty virus that she encountered on it in ~2009/2010 and am looking for some sage advice. I have a little bit of experience troubleshooting computers, but certainly nothing in-depth!

The main problem is that when I run a full scan with Microsoft Security Essentials, at some point during the scan I'll receive an error message that the scan could not be completed as the MSE service has been disabled, and that I can restart the service manually or by rebooting the computer. This does not seem to happen at the same point in the scan each time.

I have attempted to boot into safe mode w/ networking, and was able to start the scan. However I eventually received a BSOD for page_fault_in_nonpaged_area. I don't have any personal experience with troubleshooting BSOD's, and I'm unsure if that's related to a potential virus, or possibly bad RAM or other software/hardware issues.

As stated this computer is rather old (2003), and was known for having viruses on it before it was replaced. When I started working on it, the first step I took was to do all 122 windows updates on it, and then to download mbam and run it. Mbam gave me several errors when I tried to update the virus definitions, so I changed the name of the executable file to something random and was able to get it successfully updated, running and scanning. It removed 7 objects, 5 relatively harmless, and 2 files it called vundo trojans.

Now trying to run MSE to make sure Mbam didn't miss anything, and I'm receiving said error.

I apologize, I'm not sure what other computer info you might need, and I'm specifically not listing logs per the advice stickies.

Please let me know what else you might need, thank you so much!

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