Marcia - 5:11 am on Jan 11, 2007 (gmt 0)

rahul_seo, maybe it could be possible that your site got compromised without you being aware of it? Maybe changing hosts at this time and making sure all your own files are clean would help.

Do you happen to be running anything on your site that's being called from another server, like some content or graphics? I've actually had a malware issue from simply clicking on a site that was from a GIF file - so nothing is impossible any more.