Malicious deletion of files from Firefox

About 10 days ago three things happened almost simultaneously:
1. I got a message that a new version of FF was available for downloading: Firefox3.
2. I was infected with a Trojan that my spyware detected and quarantined: CHM.Psyme.
3. When I went to use my browser Firefox2.0.0.15 the message appeared that it couldn't be loaded because the file js3250.dll was missing.

So using IE instead I downloaded Firefox3. The final panel of the install wizard has a box for 'launch FF now' which I left ticked. The launch did not happen and I got the same message as before - no js3250.dll.

I discovered from the mozillaZine site that there is malware that deletes
js3250.dll whenever certain actions are performed: opening a desktop shortcut or IE, or accessing the Control Panel, My Computer, or Windows Explorer.

Using Windows Explorer I found ....\Mozilla Firefox\install.log and discovered that certain files it claimed to have installed were absent:
js3250.dll
freebl3.chk
freebl3.dll
nss3.dll
plc4.dll
plds4.dll
smime3.dll
softokn3.chk
softokn3.dll
ssl3.dll
xpcom.dll
LICENCE
README.txt
and that there was
** ERROR Registering: C:\Program Files\Mozilla Firefox\AccessibleMarshal.dll **
My Spyware Doctor with Antivirus gives the PC a clean bill of health, as does Windows Defender.

Yesterday and today I went through READ & RUN ME FIRST and carried out steps 1, 2 and 3 of the Vista Cleaning Procedure. The only malware explicitly identified and removed was found by Spybot: ErrorSmart. I don't know what may be lurking in the various .log files.

I tried to install Firefox3 again but with no success: the same files appear in the install.log but are not present. I attach three of the requested log files but cannot locate a Malwarebytes Anti-Malware log.