BSOD 0x0000007B and 0x0000007E

I am experiencing a BSOD on a Dell Inspiron 1520. All attempts to boot to SAFE mode also result in a Blue Screen
I ran MEMTEST and all of the memory appears to be OK.
I cannot get to the hard disk to retrieve any additional error information.

A few weeks ago this PC was infected with the "Internet Security 2010" virus, which I cleaned up. Not sure what has transpired since then. This is a friend's PC and I know she uses it for some kind of work.

First Blue Screen is 0x0000007B (0xBA4CB524, 0XC00000034, 0X00000000, 0X00000000)
Other Blue Screen codes are 0x0000007E (0XC0000001D, 0X8053600C, 0XBA4CB3C8, 0XBA4CB0B4)

I'm looking for some guidance - should I run a fixmbr, or could this be something else ? I can't get to the hard disk to back it up, but it's still accessible when I use my XP CD (built from a different PC with XP3 slipstreamed). I don't want to do a repair install and risk losing her data files. I'm still in a learning mode with this.

Thank you for your help.

I suggest, you start new topic in HijackThis forum to make sure, all baddies are gone.

They are familiar error messages recently, related to a rootkit, so I think you would be best following the advice from Broni
to start a topic in the Malware Removal forum.