Usually any email that tells you to delete a file is a hoax or worse something started by some one malicious out to get gullible people.
If you don't have a virus scanner and would like to see if you have a virus or trojen go to
http://housecall.antivirus.com it's an awesome free online virus checker, how ever it doesn't replace one on your computer full time, it's good to use as a suplimental check as no virus checker catches everything 100%.