ASIO time usage

I just upgraded to windows 7 64 bit, from vista, and did the same with cs5, went from the 32 bit version to 64 bit. Upon doing so my us-428 was not compatible with windows, so went out and got the us-122mkII. I just started a new song, things went fine for a while, and all of a sudden my ASIO time usage meter started to go off the charts, and it gets choppy and it sounds like i have a scratch track. I’ve played with the latency with no success. Tried restarting CS5 and the issue is still there. Any ideas or suggestions??

AMD Phenom II x4 945 Processor 3.00 GHz
4.00 GB RAM
64-bit windows 7 home premium
cubase studio 5.5.3 (newest version)

ok, i kind of feel like a door knob, but I found the problem. It was a tuner plug in that I’ve never seen before and just checked it out on a track and forgot to turn it off.