Microsoft Wireless laser desktop 7000

Bought a Wireless desktop 7000 just after New Years Because I had issues with my Microsoft bluetooth desktop in Vista. I Had one hickup in windows 7 with this bluetooth set and found a driver updated and just had to roll it back and has been fine. So to avoid problems I went to regular wireless in the hopes to eliminate any issue. Well after using the new keyboard and mouse the mouse started to freeze and got progressively worse till it became unuseable. When it freezes the keyboard would stop as well but no disconect sound just freeze then come back. I figured bad desktop set so i put the bluetooth set back on and no problems. I put the other set on a laptop running XP and have been useing it without an issue all day so the set must be fine. I know My PC is way outdated but it actually runs 7 perfectly even with dreamscene on. My usb is the SiS 7001 controller and i've tried drivers new and old, switching ports, resyncing, new batteries, every power save option is off, still the same issue. Funny is that the bluetooth receiver requires 400mA of power and the regular wireless receiver says only 100mA, so it can't be a power issue. I'm lost, i got a brand new keyboard that i can't use. Any help is greatly appriciated.

Thanks for the post, sorry it took so long to respond, I've been recovering from surgury. I did end up finding out the problem. Turns out that the receiver musta been defective and would just lose connection with the mouse and keyboard but would not disapper from the device manager. I sent it back for replacement and the guy refunded my money instead. Then i couldn't find another set , guess more people had similar problems. I replaced that set with a logitech wireless performance mx mouse and the new wireless k800 keyboard. so far everything works great and the mouse is more comfortable and the lightup keyboard is killer. I was always a fan of microsoft keyborads and the keyboard i sent back was really nice but i think logitech is more on there game with there periferals and the fact that you can charge both of thesewhile your still useing them sold me on logitech. Thanks for the help. Take care.