I would suggest getting your SW VAR out to take a look at what is happening.
Did you perform clean installs? (i.e Completely uninstall previous version before installing new).
Have you run the SW Rx > Diagnostics tool?
Can you be more specific about when the crashes occur?
What type of products are you designing?
What type of network?
Are the cards set to SolidWorks?
Are you using an Aero theme?
Are your Power settings set to Performance?
Is your mains power clean?