The hard drive bashing and running, increasing heat is mostly cause by WINDOWS SEARCH function.
Right Click MY COMPUTER and select Manage.
Computer Management will open.
Scroll down to SERVICES and APPLICATIONS, expand it and select SERVICES.
Under Services scroll down to WINDOWS SEARCH right click it. Select PROPERTIES.
A popup will open. In teh Drop down WINDOW select Disable. (You may have to stop this service first)
This should take care of teh unwanted DISK and CPU ussage.