How to Increase the Memory in Windows XP Past 3GB
- 1). Insert the XP 64 CD into the computer.
- 2). Restart the computer. Press any key when prompted to boot from CD.
- 3). Press "Enter" at the Welcome and "F8" at the license terms.
- 4). Highlight the drive containing your 32-bit edition of Windows and press "Enter," overwriting it with the 64-bit version.