Why does Solidworks freeze when attempting to modify a dimension?

Hello everyone, I have been running SW2010 SP04 for over a month without any issue until yesterday when I began having problems when attempting to modify a dimension.

The modify dimension box will appear and solidworks will freeze. I have to terminate the program through the task manager. Has anyone else experienced this issue? I'm running a Dell Precision M6400, Quadro FX2700M Video card and Windows XP.

Any suggestions on what may be causing this issue?

SolidworksSketching