Issue with Virtual Machine in Windows 2008

I am getting trouble with my virtual machine. My Server is Windows 2008 R2. I wonder what is taking up my hard disk time. Does anybody know how to find this thing out? I checked my Task Manager and it looks like it is only giving some to my CPU but my memory has been into some kind of process which I don’t understand. When I tried my Performance Manager, it showed me some useless graphs that I found not so useful to me. Please help me. Thank you in advance.
