Is everyone doing your daily and weekly and monthly maintenace???????
Anti-spyware set to operate and check your system EVERY day at set time?
Registry cleaner a couple of times a week
Backup at least EVERY month
Defrag at least two a month
Disk cleanup every day
At least once a month disconnect you puter and vacuum or blow out puter
Clean the fans
Blow or vacuum ====make sure tip is plastic so no static electricity
Overheating is enemy of puter make sure it located so air can flow