Be assured, this is a real help site. I haven't used Cobian back-up myself, but I know others that do.
So far as I know, CNET is a safe site, though on principal, I always scan files before installing them.
Please note, however, that even legitimate sites can get hacked with bad stuff. You will receive links to articles about how to make your computer more secure once you finish the cleaning process in your topic here: http://www.bleepingcomputer.com/forums/t/244497/had-11-trojans-now-have-adware-i-think-wormradar-winlogon/
If you have access to another computer, I'd advise using it to check your topic for responses. Even if your computer didn't have issues, the e-mail alert system can be glitchy.
Help us help you. If HelpBot replies, you MUST follow step 1 in its reply so we know you need help.
An ounce of prevention is worth a pound of cure
SpywareBlaster, WinPatrol Plus, ESET Internet Security, NoScript Firefox ext.