Sometimes, you need to reboot Windows (e.g. when installing new software), but there is no need to restart BIOS, too. However, the default is to reboot both. (That’s called doing a “cold boot,” rather than a “warm boot.”) There’s a trick that works on both XP and to get it to do a warm boot instead, thus saving you 30 seconds per cycle.
The trick is to hold down the SHIFT key when invoking the restart.
Windows XP: Select Start. Select “Shut Down…”. Change the drop-down combo box under “What do you want the computer to do?” to “Restart”. Hold down the SHIFT key while clicking on the “OK” button.
Windows Vista: Select Start, then hover over the right arrow that is to the right of the padlock icon until the appears that contains “restart” as one of it’s choices. Hold down the SHIFT key while clicking on the “restart” choice.