THe ONLY time you need "hibernate" is when you want to save battery power to your laptop. If you have a desktop using AC current, there is no benefit at all.
I am running XP Home-SP2. When I try to hibernate my computer I get a pop-up that says my communication Port Com2 isn't working. It said to update the driver which I did but the most currant driver was installed so that was not the problem. I still cannot hibernate. I hope you can help