1) Restart computer.
2) Press F8 repeatedly during start up.
3) When it gives you a list of choices, choose Safe Mode with Networking.
4) When booted up, go on the internet, download and install Kaspersky Internet Security 7.0 Trial (Full features for 30 days), and run a whole system scan.
5) Restart computer normally without F8.
6) All viruses, spam, spyware, etc. should be gone now.