Contrary to popular belief, it is extremely rare for ram that worked fine previously to suddenly go BAD.
If the ram HAS NOT been changed from what was installed before when it worked fine with the system, then you cleaning and reinstalling the ram probablt proves it wasn't the ram that was the problem.
Does she have, or do you have, or can you, or she, borrow a full version (not an upgrade) Windows CD of the same version as on the computer - Home or Pro?
If so, you could try what many call a "Repair install" procedure, what I prefer to call a "Repair Setup" procedure.
An XP Repair Setup will (almost always) not harm your existing Windows installation, but it can only fix things Windows detects as wrong, and/or replace corrupted or missing Windows files that are on your original XP CD. In the case of drastically changed hardware, it will set Windows to the new hardware situation.
You will need a Windows CD of the same version as the one of your Windows installation, and the Product Key, preferably the one that was used to install it, but it can be one for the same version as the one of your Windows installation.
In most cases you get the Product Key from the official Microsoft sticker on your computer case, or from the official Microsoft sticker that came with your Windows CD if it has not been stuck to the case, or if you can't find that or don't have that, you can use a program to find the Product Key your Windows installation is presently using, BEFORE you run the Repair Setup (Repair install) - e.g. search for: keyfinder, by Jelly Bean whatever.
DO NOT run this procedure if you don't have a suitable Product Key!!
Unplug everything plugged in externally to the computer that is not necessary for running Setup.
How to do an XP Repair Setup, step by step:
In order for the computer to boot from the Windows CD, the computer's bios must have the boot order settings set so a CD drive is listed before all hard drives.
If that is set right, when you boot with a bootable CD or DVD in a drive, you will see "Press any key to boot from CD" or simliar - you press the specified key while that is displayed on the screen - usually within 5 seconds.
If you don't see that...
- if the computer has two or more optical drives, many bioses will only boot from a bootable CD or DVD in one of them - try inserting the disk in another optical drive.
- if that doesn't apply or doesn't help, you need to go into the bios Setup and change the boot order so a CD or optical drive is listed before all hard drives - it doesn't have to be listed first - if the computer has a floppy drive that should be listed first.
The CD must be clean, and the optical drive must have no problems reading the Windows CD - I recommend you use a laser lens cleaning CD in the drive BEFORE booting with the Windows CD.