I am not sure how related is this to your cause, but I thought I will still pointed out as I seemed to suffer the same affect you are facing at the moment back then. Are you running any Linux guest OS on there? If so, have you installed the proper IC & re-compiled the kernel as required to limit the resources it eat of your system. I have not doing that and running a Linux OS as guest it can be a huge memory & CPU Hog and render you system to be very slow. If you are not aware of how to install IC & Compile the proper kernel for your guest OS you might want to look at:
Install SUSE Linux Enterprise 10 SP1 & Component Integration for Linux on Hyper-V
I hope that help if not you in particular, then other readers of this forum who face this funny problem that I had suffered with for 2 weeks before i was able to resolve it.
