You have quite a few problems on your computer
Let's start with some cleanup
Go to this link and install the Trial version of KAV Personal 5.0 Trial (good for 30 days)
I need you to install this Anti-Virus software, we can uninstall it later and get you a free one for everyday use
http://computercops.biz/postt106277.html And follow all the instructions closely, including downloading and running their trial AV in safe mode and ensure it's updated
Also ensure you get a copy of Hoster
Any step missed may require you to start the WHOLE procedure over again
So look it over carefully
The AV must be updated, don't assume because you have it installed it is updated
Once you have completed the scan remember to Save the report to post it back here
Along with a fresh Hijackthis log