the good news is your HJT report looks clean, the bad news is that I don’t know what could be causing u problems. I would advise you to look for rootkits by downloading icesword 1.20 for vista from here: http://antirootkit.com/software/IceSword.htm . Once you have it installed, click on all the left tabs one by one going down and report any of the ones that show up in red (do not try to delete or dissable them because there are some security programs that run with rootkit-type behavior such as vsdatant by zone alarm firewall’s truevector).

That’s about the only other thing i could think of malware wise because ur report looks clean.