Take a look at this blog.
This guy had the same problem, and now he has solved it. Give it a try.
Posted by twig at 11:34 AM Sunday, March 1, 2009:
Ever since upgrading to VMWare v6.5.1, I've noticed it would take
several minutes for my laptop to respond to input after closing VMware
or pausing/shutting down a guest.
The excessive harddrive activity would halt my host operating system
and prevent hibernation from working (causing me to nearly miss my
train station several times!)
Luckily, someone's found the solution to fixing this problem by
setting some hidden configuration options.
Open up your "guest.vmx" file in Notepad and paste the following lines
at the end of the file.
mainMem.useNamedFile = “FALSE”
prefvmx.useRecommendedLockedMemSize = “TRUE”
prefvmx.minVmMemPct = “100″
This has stopped the excessive harddrive activity on my laptop and I
have been able to get off the train on time.