Help Samsung Galaxy S GT-I900T usb connection problems

dim3bu9

Lurker
I upgraded my samsung galaxy s gt-i9000t to froyo and after 2 or 3 weeks of the upgrade i cannot connect my phone to my laptop. It says that usb connection not recognized by the computer. My laptop have a windows 7 64bit operating system. I already done factory reset but still i have the same problem. Please help me.
 
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