I just don't use it on desktops or laptops at all. It just causes too many problems and takes up hard disk space. I turn it off. When I'm done, I shut down windows and turn off the system....always. I have a laptop I use for work....a nice IBM that's great. Some of my coworkers complain about startup problems and lockups. When I ask, "What do you do when you're done with it?", the answer is they usually just close the lid and let it go to sleep..hibernate...whatever. The only problem I have with my laptop is when I leave it on for long periods of time without using it. It will slow to a crawl and pause during use. This will probably be due to some memory leak. The cure is just shut down and restart. I know laptops are supposed to have the convenience of quicker startups using hibernate mode but that seems to come with more aggravation. Consider just shutting off when done and not wasting time getting hibernate to work. My three cents.
I just bought an Acer Aspire 5920. The computer goes into sleep or hibernation mode (what's the difference?) and I can't get it to wake up. I have to power down and then I get a message that the computer wasn't shut down properly. I then have to restart in safe mode. Very annoying. I've never experienced this before with any computer or operating system.