Can't open programs normally

Since my roommate was looking at porn on my computer and not his own, I can't open programs, like incredimail to get my emails. Microsoft Work is saying Application not found. Help:cry

 

I suggest you go to Malware Removal Guide and go through the House Cleaning procedure.

You will want to keep some of the programs that you will download and use in this process.

Also, read How to Protect Yourself from Malware

You may try using a Restore Point in System Restore that was created Before the problems began.