Why can I not format or delete files from my pen drive?

Anonymous September 24, 2011
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I want to delete all the files on my 4GB pen drive. But when I tried to delete, the deleting window opened, but it never started to delete.

So I removed the pen drive,d connected it again, and I clicked “scan and fix (recommended)”, but it never ended and got stuck there. Then I tried to format it, but it never started either. And when I tried the second time, it said “You do not have sufficient rights to perform this operation.”

I also tried to use Command Prompt to clean my pen drive, but failed.

How to fix it?

*I’m using Windows 7.