I updated the laptop originally a couple years ago to SP3 and I started having router issues. When that lappy eventually crashed, unrelated, I reformatted and updated up to, but not SP3. I just didn't want the headache. By now, it's probably fine to update. In fact, most software requires SP3 now. But on two pc's, I'm still at SP2 with no issues. And I still get updates but I check them and since opting out of SP3, I have not been bugged about it.

Dan