Reinstalling usually does not help. What is your OS and version, amount of RAM as well as your type of graphic card?
Win 7 home premium 64 bit
intel i7 920
I have to say that if this isn't enough , most people will be in trouble.
Its been working fine if slowly for the last month then today crash .
Checked for virus etc but that didn't help .
Tried my old version 5.7 which works with no problem.