Just a quick word of warning on hibernating.......
When your working on your pc the longer your on the more fragmented your memory will get.
Simple way to look at is when you use 100k ram and then release it when your program shuts down your next program looking for 200k will use the next contiguous block until all contiguous blocks are utilised and then it will fill the gaps.
When you hibernate - it copies the memory verbatim and loads it back up verbatim - thats why its so quick. You will still be left with the fragmented memory.
I am pointing this out not as a problem but the longer you do it the more performance degradation you will experience.
btw - norton 360 I use and I dont see any performance hit and it does not nag like others. I personally will renew mine, it does what it says on the tin with no intervention.