However, as suggested, I have initiated a Comodo scan. The virus database started 40 minutes ago. and jumpealmost immediately to 30% and has been frozen there since then. Is this_normal?
Unfortunately, yes. The database is quite large, so it takes a long time to download even on a fast connection. The progress indicator isn't a very useful indicator of how the download is actually progressing. It will stay at 30% for most of the download. Are you seeing network activity?