Hehe, I hate when my comp goes to sleep or hybernate because for some reason, some things that are plugged in my mobo wont work. Like after it goes to sleep, it somehow disconnects the wifi that is built in the mobo, i have to disable it and re-enable it in the device manager. This happens on things plugged in the internal usb in the mobo too. so i just disabled it from sleeping or hybernating.
Here's how you do it on vista....
1. Click Start and type on the search bar "Power" and it'll show the Power Options.
2. Click Enter then the Power Options window should popup.
3. Mine is set to "High Performance" but do what you want, you can select from Balance, Power Saver, and High Performance.
4. Select one of them and click on "Change Plan Settings"
5. Click on "Changed Advance Power Settings"
6. Expand the Sleep thingy then Set both Sleep and Hybernate to "Never"
7. Click on "Apply" then "OK" then "Save Changes" this ensures that you will save the settings correctly.
8. Done!