I would suggest you download, install and run Spybot Search and Destroy and Malwarebytes. Here is the link to the sites

http://www.safer-networking.org/index2.html 

Malwarebytes 

http://www.malwarebytes.org/ 

Both are free and very effective. That may sound odd, but there are a dozen of users experiencing crashing and freezing problems and we solved them just cleaning the malware. Let us know what happened after these steps.