I'm unable 2 remove this virus named RAVMON.exe from my flash drive... please suggest any solutions

I would disconnect the flash drive from your computer immediately and download Spybot Search and Destroy 1.5, AVG Anti-Virus, and for future reference McAfee Site Advisor (Firefox) or McAfee Site Advisor (Internet Explorer). (You only need the first two programs for virus removal.) So after you are done downloading, insert your flash drive and make sure to scan the Drive it is in. E.g. D:/