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#21
Does the problem happen with multiple different USB sticks or only the one? If the problem happens with only the one USB stick then that would eliminate your AV software as the issue. If you haven't tried any other USB sticks it would be helpful if you could try another to see if it behaves the same way.
The fact that the problem happens with multiple computers also tends to make me believe that the issue is the stick itself, coupled with the fact that you get the message to fix corrupted files when you plug it in. Have you tried answering yes to that question?
Since chkdsk doesn't seem to be working for you, you might try a 3rd party tool such as this one: Data-Doctor-Recovery-Pen-Drive. I've never used it so can't attest to how effective it is but it would be worth a try.
Strollin has some good suggestions - please also follow upon that.
The chkdsk output should look like this:
Code:Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\Windows\system32>chkdsk /R F: The type of the file system is FAT32. Volume PENDRIVE created 15/08/2012 8:41 PM Volume Serial Number is 4EB3-A10B Windows is verifying files and folders... File and folder verification is complete. Windows is verifying free space... Free space verification is complete. Windows has checked the file system and found no problems. 7,808,000 KB total disk space. 36 KB in 1 hidden files. 16 KB in 4 folders. 1,809,148 KB in 24 files. 5,998,796 KB are available. 4,096 bytes in each allocation unit. 1,952,000 total allocation units on disk. 1,499,699 allocation units available on disk. C:\Windows\system32>