The VAIO PCG-FRV26 was acting pretty bad this past week. Though no viruses were being detected, I was getting strange errors from ikernel.exe. Probably from installing and removing software over the past few months.
I think the last time that I refreshed the system was in February when Trevor was born and I was staying home. From November to February, I was refreshing my system every 1-2 months just to keep the fragmentation and excess to a minimum.
Here is a link to my current software requirements.