Your pendrive could have got a worm on it. You should be sure that you run a scan to try to find them. There is a wormt can hidethe files on your pendrive and is called w32.USBWorm. To resolve this, you must open your system in Safe Mode and make a search in C drive with the Advanced options set on. You should search for the hidden files and browse for some file labelled as heap41b. This should be the same file that is located in your pendrive, then make a search of the same file through your E/F drive also.
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