Are you using an HP all-in-one printer? There is a program for them loaded at startup called hpqtra08.exe which is known to consume 100% of the CPU at times which will prevent Strata from being able to update the Modeling Window as it should.
This in turns causes the OS to report that the program is Not Responding. One solution to the problem is to disable that program while running Strata. Other possible solutions are discussed on different web forums.