Motorla Flipside won't stay connected to PC via USB Cable

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http://forums.androidcentral.com – Hey Guys! My sister decided that she wanted me to flash her Motorla Flipside. So I decided I would just root it and format the phone and everything. The problem now is when I plug in the USB Cable to the Phone and PC, it goes from connected via usb to scanning memory card to connected and so on. It will do it constantly. If we plug it to charge with the usb cable, it works. I have 1 PC and 2 Laptops but none of them made a difference. Please tell me what I can do to fix this. The only thing that I am thinking is another cable. Oh. Also, I know the phone can connect to the Laptop, beca (HowTos)