I suspect I have a virus, what should I do first?

Viruses are very common, if you suspect of a file, the first thing you should do is to send it to Virustotal and have a report of multiple antivirus scans. This can be done either by uploading it to www.virustotal.com or by sending it by email to scan@virustotal.com with the word SCAN in the subject field. According to the scan results you should report that file to your antivirus producer so he can integrate that virus in their definitions.