The tweaks mentioned below are for speeding up Windows XP.
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Disable boot virus detection:This feature is available for some motherboards. If enabled it will scan your boot sector for virus infection every time you start your system. As boot sector viruses are rare now, it is safe to disable it. Disabling it will also speed up the boot process.
To find out if you have it look in the ‘Advanced BIOS features’ section of your BIOS.
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Change Boot Sequence:For most PC’s the boot sequence is first set to CD-ROM and then to Hard drive. You can speed up your boot time by setting your OS-loaded hard drive as the primary boot device.
I suggest to disable other boot devices such as CD-ROM and Floppy.
Just remember to set CD-ROM as your primary boot device when you need to re-install Windows.