Waaahhh…. My 8 gig usb is no longer readable! I bought it just last month.. I regret I was able to plug it to our office desktop computer . I didn’t realized that the PC’s anti-virus already expired. Reformatting the USB will erase important files, is their another way to troubleshoot it? Please I need your help. Also it is safe to buy anti-virus software through the internet? Avast Anti-Virus software is on promo at 70% discount. Have you tried purchasing it online ?