That board uses the FTDI chip. Do you have the FTDI drivers installed? Sounds like you don't? They're included with the IDE...
Also, does the board still work on the WinXP system? There was an issue with arduino clones build with counterfeit FT232RL chips, and one version of the drivers the company put will actually brick the counterfeit chips (google ftdigate for more info) - if you got a board with a fake FT232RL chip, your only recourse is to try to get a refund. Since it's impossible to assess if an FT232 chip on a board you're buying online is counterfeit, the only safe response is to never buy anything with an FT232 in it.