VISTA Home Premium 32 Bit Memory Stick Problem

All of a sudden, I have not been able to use my USB memory stick in my computer. It is a SANDISK Titanium 2GB. I have tried other memory sticks with no luck either. I am unable to format, access or do anything to any memory stick. Any suggestions? Other devices are working fine in my USB ports. I am using VISTA Home Premium 32 Bit.

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