Posted 22 June 2006 - 08:51 AM
Well Gregz... I don't think this is the place to post this kind of thread (should be in the technical support section), but I'm new here so I'll give it a shot anyway.
First of all, you can't expect anyone to help you without including your system specs, version of windows, details about the error in question and any other pertinent information. Based upon what you've given us, the only advice I can give you is that the virus that was on your HDD corrupted some files on your computer (probably your windows files) and because of that certain applications (like HL) won't run.
Find your Windows CD and try using the repair windows option once it loads... If that doesn't work, I would suggest a fresh install of windows.
I'm not a vegetarian because I dislike meat, I'm a vegetarian because I hate plants!