Did you have it in the past, cleaned it, and it damaged your copy of riched20.dll? If I recall correctly, the riched20 file was completely replaced by the virus and the only solution was to restore riched20 from the original installation CD. (Haven't read back in the thread to see if you re-installed riched20 from the CD or not.)

Never had Nimda. Going on 14 years without ever being infected with a virus or worm, actually.

Anyway as I mentioned earlier in the thread, I renamed the riched20.dll in my system32 directory and installed RMM, and the file reappeared, which means that RMM put its own copy (which obviously wouldn't be corrupted) there. Still no joy.

I'm very close to giving up and reinstalling Windows, I've pretty much tried everything.