MICROSOFT.WINDOWS.XP.PROFESSIONAL.WITH.SP3.x86.RTM .OEM.ENGLISH --what OEM exactly is this copy, because OEM isn't universal?
It clearly seems you do not know which bit your processor supports, 8 GB ram is for 64 bit and 32bit can address at least 3.5GB of ram even if you put 4 GB of RAM, that the way it is. You should search for 64 Bit XP SP 2 VL 64bit edition
He can also use OEM:SLP activation for xp x64 mind you wga never came out for xp x64 vlk version so the key does not get blacklisted. Biggest problem was away drivers.