I am using Kingston USB drive for my personal use. It has been effected by virus and I had formatted and regularly checks for virus through antivirus. There no problems seems to be blinking. But when I stores any data in my USB drive and tries to open it through My computer, suddenly a virus information is seen that my USB drive is infected with Trojan virus and all. So what could be the reason for this? Any idea regarding this would be great. Thanks for the time.

This might be due to the lack of updating your anti virus program. This have to be updated when you are connected to the internet. This does automatically. So please check whether that option is enabled in your Anti virus program. Virus seems to generate very fast and new things seems to be populating daily. Thats the main use of updating our old database of antivirus program.