[Q] Usb storage not working

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http://forum.xda-developers.com – I have an samsung galaxy mini s5570 with cm7 . This has started happening from yesterday . When I connect my phone to the computer , it charges but the usb mass storage doesn't comes up . Instead a message pops up on my pc saying that " Windows can't recognize the usb device " . One more thing - The coating of my usb wire has come out a bit in the middle and I can see the red and green wires in between . But as my phone is charging when connected to the pc I doubt that is going to be an problem , right ? So what do you guys think is wrong with my cell or my pc ? (HowTos)