DS crashes randomly when trying to open .dwg files on network or local drive

Anyone have an idea as to why this will happen? I'm using Win7 64 bit, latest DS release. Sometimes when opening a drawing (usually a .dwg) DS will just crash or lock up. I've noticed this especially since the last few updates of DS. Sometimes when you go to "File, Open" the window will be blank and then the program locks up. What's odd is that my home PC (Win7 64) works fine with DS and very rarely ever has any issues with crashing.

Thanks for any help.