I change a hard drive (from 5400rpm to 7200rpm) recently.  After changed, the speed is faster, but some problem showed up.  For example: 
1. when I type 'close all' in command line, and hit 'enter', Logos freeze!  
2. If I try to do two passage analysis, it will cause Logos 4 freeze.
...
I think something wrong during HD changing.  Do I need to reinstall Logos 4?  Or Is there anyway to diagnose my Logos 4?
 
Thanks!
 
Andrew