First thing... get a Linux LiveCD like SimplyMEPIS that has unionfs support and boot off it, it'll let you access your Windows install outside of Windows.
Secondly, boot into the LiveCD and access the internet, go to Google and search for Trend Housecall. Run their free online scan, it should hopefully work through Firefox and let you do a quick clean of the hard drive. (Enough to access the internet from Windows.)
Next, download Malwarebytes, Spybot Search and Destroy, CCleaner and Dial-a-fix and burn them off onto a CD inside SimplyMEPIS. Reboot into Windows Safe Mode with Networking (from the F8 option on reboot before the Windows logo).
Run the setups for Malwarebytes and Spybot first, install them and run them. Reboot after each back into Safe Mode with networking. After those are done, reboot into Normal mode and run Dial-a-fix and then CCleaner. Reboot after each.. and finally go back online in Windows and go back to Trend Housecall and run another scan from there.
That should get a lot of it patched back up for you.