From my experience Panda’s online scan is a good one. It uses active-X, so only for the IE. I personally have no need to call it trash.
Or the need to remove it so deep.
Just remove the install folder if space is really limited on your HD.

Another one good to use is Trend Micro’s online scan:
http://uk.trendmicro-europe.com/enterprise/products/housecall_launch.php

That one uses a Java trusted applet, so no active-x needed.
Works also in firefox etc. browsers.

As much as we trust Avast, it is always good to have a second hand check, and for that online scanners above are fine.