I believe it is a system setting that can't be changed without messing with something deep down inside of SW. Doing so might anger SW, thereby causing indescribable horror and pain.
Then again, someone else may know of a simple and easy remedy...
Jeff Mirisola, CSWP
CAD Administrator
SW '07 SP2.0, Dell M90, Intel 2 Duo Core, 2GB RAM, nVidia 2500M