I had chitty anti-virus software bitdefender. It's let the wimad virus into my machine. I purchased Kaspersky anti-virus but I can't install it because I can't unintall bitdefender. And I can't uninstall bitdefender because the virus has locked up the windows installer. Soooo if someone coud explain in detail how to fix windows installer or use the command prompts in safe mode to uninstall bitdefender I think I can fix it.