Anything that doesn't work right, like your hotmail login, may mean its being redirected to a logging site. Dont check your internet banking or anything important until it's fixed/reinstalled.
Follow these threads. Easiest way to give you all the steps without repeating them.
http://forums.majorgeeks.com/showthread.php?t=35407
http://forums.majorgeeks.com/showthread.php?t=139313
Compaq's may have a 'Press F11 for recovery' when you first boot the laptop, before the windows splash screen. If it's Vista, there may even be a factory recovery option listed in the startup menu. Press F8 repeatedly just before the vista logo, then choose 'repair my computer'. Turning off the laptop and rebooting while the vista logo is scrolling should display the same menu.
AVG Free
free.avg.com should be the minimum antivirus you should be running, and weekly scans with malwarebytes antimalware
www.malwarebytes.org should help keep your computer clean.
You shouldnt need to pay to remove any of this stuff. Buying the 'products' such as the one installed in the original post only helps these guys spread more bad stuff, create bot-nets for spam etc. XPAntivirus2006 etc are the most common ones, and even make the computer look like its bluescreening and rebooting (great to see the xp startup screen on a vista machine).
Big Tip: ----
A simple google on perfectdefender showed this page:
http://www.bleepingcomputer.com/malw...-defender-2009
Just follow this. And have a look around the bleeping computer site. That and majorgeeks forums should get you out of trouble.
All else fails, take it to an expert.
