It was only when it Avast was updated to version 8.0.1497 that it found this supposed infection. I allowed Avast to remove the infection & then run a boot scan, which did not find any infection. Yet, when my machine finally booted into Windows XP again, Avast 8.0.1497 once again said that my machine was infected.

I have a screenshot of the Avast warning message & also the logs from the programs you asked me to run, but when I try to post them to the forum, I get the following error message:

413 Request Entity Too Large

I will try attaching the logs in separate posts.