Pro Tools SE does not recognize M-Audio Fast Track C400 says:"impossible to identify the hardware AVID,check if it's connected(OS windows7)

Hello!! I bought 3 months ago the M-AUDIO fast track C400 and related software Pro Tools SE.
Until last week worked great, but then, when I plug in the sound card and launch pro tools does not work, it says that m-audio is not connected..but is not so..I reinstalled the software, checked the PC but nothing..
Can you help me please??? I do not know how to do.... Thanks for your help guys (and sorry for my english, I'm italian)
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