Reply to Ableton Suite 8 CPU Collapse Help

My computer specs:

CPU: AMD Phenom II x4 965 3.40ghz stock
Motherboard: Asus m4a785-m
Graphics:XFX HD 5770 1GB
RAM: Corsair XMS2 4gb DDR2
Hard Drive: Seagate 750gb
OS: Windows 7 Ultimate 64bit

Ok so i downloaded this "Scary monsters and nice sprites" remake from youtube:
http://www.youtube.com/watch?v=VkKKiL0BdOA

then i opened up the project file and i played it, from the start the sound started to skip a little bit then after 10 or 20 seconds, THE CPU USAGE HIT 102% AND THATS NEVER HAPPENED BEFORE, then i stopped the sound and restarted it and it worked fine, but then after a minute or so, it happened again, it is pretty random after i start and stop it several times it will stop or start again

So please help me, My computer should be able to handle this and I dont know why it would be lagging so hard...