Just registered so I could post this.
I have read all the threads online describing the "system freezes for 30 seconds and highest active time at 100% for no discernable reason" as i have had the problem since i got my new Acer Aspire.
I fixed it by going into the bios and changing the hard drive from AHCI to IDE mode. Before doing this I was having freezes every couple of minutes. Now it hasnt frozen since i changed it 3 weeks ago.
You dont need to worry about latest drivers, virus updates, system info. Just change to IDE mode in bios and if its like mine you can get back to what you were meant to be doing...