Gabriel upgraded his XP system to 4GB of RAM, but now the computer is running slower! Leo says RAM usually either works or doesn't work. The 4GB shouldn't slow it down at all. Leo thinks it's coincidental. He advises trying to run a boot CD and see if it boot sup fast or slow. This will tell Gabe if Windows is corrupted or not. It'll also let him know if the hard drive is to blame.
Leo also says to update the ESCD of the BIOS. Reset it and it'll see the new hardware. He should check the motherboard battery as well. Leo thinks the hard drive is going bad and they're cheap, so he should try replacing that.