I had this happen to me and a restart would not fix it. I had to Ghost back to a later image to get it working again. I'm using HVR 2200 though.
It started doing it right after I installed MCE buddy, and when a program kicked in to record I changed channels. Popping up with the same error you get. Nothing I tried would get it going again.
Not saying MCE buddy had anything to do with it, Its just the only thing that I changed before it happened, More like changing channels and a recording starting at the same time corrupted something in mce for me.
After the Ghost everything runs fine, but have not installed MCE buddy again yet
