PCSGU250 keeps disconecting from USB, W7

I used to have XPs on my old computer and everything was working just fine. Then i got a new machine and W7 and (after installing the W7 driver) it keeps disconnecting (sometimes it reconnect and disconnect again) from USB. I tried to feed it from 2 USB slots with no success. Shall i get an active USB hub?

Thank you.

Yes, the problem may be solved by using an active (self powered) USB HUB.

I used this utility http://event.asus.com/mb/2010/ai_charger/ to enhance the power feed from my USB ports. It started working flawlessly.

Thank you for the reply.
It is good news that the ASUS Ai Charger software solution can be used to fix the USB power problem!