Computer goes blank on inserting USB pendrive

[a_b]

Hi!!! Hope all u here can solve my problem.

Well i bought a Sandisk 2gb usb pendrive a few days ago.
When i insert the pendrive in the usb port the computer recognises the device and in the tray icon shows message mass storage device.
As soon as i try to open the drive or click to activate the device my computer screen goes blank and then i cannot even switch off my computer & it seems that the computer has hanged & i can't do anything to revive the system.
I have to put off the power to switch it off.
Next time when i switch on the pc a message is shown which says that the computer has recovered from a serious error.

Hope ne1 can help me as i need to use it urgently to transfer important files.