Hello, This is my first posting, I am retired from the 3M Co. and live in Tucson AZ. I see quite a few good things from here when I googled my problem and hope I can receive a solution. My System: HP Media Center PC m7674n 2 Gb Ram Originally shipped with XP Upgraded to Vista Home Premium 4 Months ago Updated to Service Pack 1 two days ago I have seen two types of Error messages: Recently I am gitting the "Attempt made to write to Read-Only Memory" error message. Saw about 4-5 times. And "Kernel_Stack_Inpage_Error" Saw one time. Seems this is a ram issue, Correct? If so what is a safe way to test ram? Any Ideas????