encyclo - 7:17 pm on May 23, 2005 (gmt 0)

Have you done a full security scan of your server? 95Gb a month of illegal movies served via an IRC channel or other similar ways could well be the culprit. Your hosting company sounds distinctly unhelpful to the extent that I would start searching for a new provider as well.

I assume that you're on a fully dedicated server, so you could start by checking hard disk usage (AVI files take up a lot of space) and running services. I'm a Linux guy and don't have any experience in running Windows servers, but I'm sure others will be able to suggest Windows-specific tools, but you can use Unix tools such as Nessus [nessus.org]. A few other ideas here:

[insecure.org...]