Repairing a client's Desktop

Model: Dell Dimension 2400
OS: XP Home

Error: BSOD; Process1_Initialization_Failed ***Stop: 0x0000006b. (0xC000009c, 0x00000002, 0x00000000, 0x00000000)

Running memtest86+ revealed a bad memory module. Replaced and re-ran test passing 15 tests.

Upon reboot, same BSOD.

Understand this can be a Norton/Roxio - Ghost/Go Back issue.

BSOD on regular bootup, last know..., Safe Mode and all others.

Client has not located Dell Supplied Disk, XP Home Authentication sticker w/key code is on machine.

Problem: When trying to perform a repair (After hitting F8 and Selecting Setup Windows now) I am highlighting the C Drive where the OS is installed.

Pressing 'R' does not perform repair.

Is this because:

I am not attempting repair using the supplied Dell OS disk?

or

I am using an original xp Home disk (no service packs)?

Trying to avoid placing the HDD in another machine to backup the data/reinstall OS and I've never performed a repair on a Dell brand machine.

Thanks in advance.