First two problems: Virus. You downloaded something and it had a virus, good job. Reinstall Windows.
Excessive moaning ain't gonna help the guy.
First up, if you have access to another computer, download Avast antivirus and AVG Free antivirus. Those should be enough to fix it, and you don't have to keep them. Both are free.
Transfer them to your laptop, and install them. If you are unable to do this, say, if the computer blocks it, save your goods onto a memory stick and wipe it; your computer may be beyond most conventional help.
If it installs, run them both, they pick up malware and viruses, so that should work.
Remember to do a boot-time scan with Avast, so that it can delete viruses that protect themselves.
Reply back if you have questions.