cleanup after malware/trojan/virus

Tech-Archive recommends: Fix windows errors by optimizing your registry

I've found and removed a trojan from my wife's laptop using Microsoft's
malicious software removal tool, AVG, Trend, and Malwarebytes...

There are still some lingering problems that I need help fixing. Note that
in the process I did a repair install of Windows XP SP 3, hoping it would
resolve some of this (but instead I think it created a new problem).

I also had to do some cleanup in the registry -- windows updates was
disabled as the malware had renamed %SystemRoot% to %fystemRoot% in several
service entries. I have fixed all of those after jumping through several
hoops (finding a way to run regedit, resetting permissions on those subkeys,
etc.)

1. I still cannot run REGEDIT or REGEDT32 from the command prompt, from
Start->Run, by double-clicking it, etc. When I try, nothing happens. I use
Don Knox's emergency utility creator and I can run REGEDIT from another
folder when it is renamed, but how do I clean up this nasty problem? Is it a
registry entry? A piece of software still installed and running somehow? Etc.

2. After doing the repair install of Windows (this is a Dell Inspiron 700m),
I cannot adjust the Display Settings for the screen resolution. In Device
Manager, the Intel integrated graphics chipset is listed twice both with the
yellow error warning and Code 37. I have uninstalled them and run the
installer software multiple times from both Dell and Intel to no avail. argh.
Any ideas here?

Anything else I should be looking for here? I am really desparately trying
to avoid a reinstall of Windows.
.

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