Unless that's a really nice one, just look around for a new one. I feel quite sure it's much more trouble than it's worth to try and fix it. I got a USB scanner for about $10 new. It didn't have the box or anything, but it works great.
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Primary- i7 920 | 6GB RAM | 9800GT | 160+160+500GB
Secondary- Athlon X2 4200 | 2GB RAM | 7600GT | 80+250GB
Netbook - Atom N280 | 2GB RAM | GMA945| 160GB
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