I agree with adamvjackson, in which case unless you are having a problem, it is best left alone. A second alternative to going into BIOS through windows is the following:
1.Click Start, point to Settings, point to Control Panel, and then click System.
2.Click the Hardware tab, and then click Device Manager.
3.Double-click to expand the Computer branch. Note the type of support that you currently have.
4.Double-click the computer type that is listed under the Computer branch, click the Drivers tab, click Update Driver, and then click Next.
5.Click Display a list of known drivers for this device, and then click Show all hardware of this device class.
6.Click the appropriate computer type (do not change from non-ACPI to ACPI computer types), click Next, and then click Finish.
This is a hardware reset and you will have to reboot, which means that it is possible to throw something out of kilter and force a re-install.