HELP!!! PLEASE!!! Read/Write failure

[lopsie96]

I have been receiving these two messages when I try to boot my Dell desktop. It has Windows XP and is the Dimension series.

Memory write/read failure @ 9FF9000C, read F900F916, expecting F916F916 AND

memory address line failure @ 9FF9000, read F916F916 expecting 06060606

Someone please help me with what I am supposed to do from here!!

Thanks