Get systernal's Process explorer from the MS Site http://technet.microsoft.com/en-us/sysinte...s/bb896653.aspx and see what is opening and closing each time you do this. I've never heard of something like this happening that's soooooo bizarre. See if it still does it in Safe Mode.
Run and live cd version of a antivirus and a rootkit revealer and make sure you don't have some sneaky fellow.
If you have the same problem when you try to download the hjt log or it won't let you use it, still make a post in spyware hell and tell them what is happening.
Alix Do you have access to another computer??? Hijak this and CCleaner will run portably, this may be the way to go.
Also, esp if this is Bagel, here is a link to portible multivirus cleaner (at portablefreeware.com) it handles bagel http://www.portablefreeware.com/?id=810
and here is trend micro's cleaner that'll run porably and in safe mode