In Windows Repair then I choose any of the 3 alternatives in "Start Repairs" and then I click the button "Back" the program crashes.
I have win7 64-bit.
I get this crash dump:    
System 
  - Provider 
   [ Name]  Application Error  
  - EventID 1000 
   [ Qualifiers]  0  
   Level 2  
   Task 100  
   Keywords 0x80000000000000  
  - TimeCreated 
   [ SystemTime]  2011-10-09T05:46:02.000000000Z  
   EventRecordID 7296  
   Channel Application  
   Security  
- EventData 
   Repair_Windows.exe 
   1.3.0.1 
   4e90a013 
   unknown 
   0.0.0.0 
   00000000 
   c000041d 
   74b74c4f 
   1714 
   01cc8646b0111eff   
   unknown 
   f83d1b75-f239-11e0-a774-f04da2663c5a 
But if I go to "Start Repairs" again and use the red close button the program dosen´t crash.
Great program!  

 I haven´t used it cause my win7 is working great. But its good to have if something goes wrong.
The program its a little bit like windows 8 refresh option?