Added Ram stick to older computer...

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Guest

Guest
Tried adding a ram stick to an older XP from another XP.

They are both AMD athlon computers.

The computer I tried adding it to already has two ram sticks from valueram and I tried adding another corsair 512mb to it. When I booted it up afterwords it just said an unknown software was added blah blah cannot start. So with that being said I took it out and booted up and still saying the same thing now... Was going to install Windows 8.1 on it or Mac OS X afterwords but having problems with the ram at the moment.