Hi,
I am facing one unusal problem since last week, When i am inserting any pendrive in PC at any USB Port, Its showing me "removeable drive" and whenever i trying to open it is giving "Drive is not formatted, Format first" when i click on yes then PC tries to format but fail to do in last.

But all pendrives are working in other PCs. I have done following activity.

>>Driver reinstallation, and after installation driver is showing working properly.
>>Scan for any virus but no virus found
>>Plug and play setting from services. and it has started

All the four ports are not working for Pendrive only but when i am connecting any Portable hard disk then there is no problem.

Pls help what step i should take to correct this problem.

dks