Question : Memory errors and blue screen

Dell 5150 desktop just over 3 years; have not added any new hardware/software recently.  Getting memory errors (i.e. - xxxx application error;  instruction at xxxx referenced memory...memory could not be written).  Different applications and memory locations.  Also getting occasional blue screen errors.  Ran Microsoft memory diagnostic - found errors on Dimm 2 memory, Dimm 1 ok.  Removed Dimm 2 - reran diagnostic and now it is reporting errors on Dimm 1 (which was fine before!)

No apparent pattern to the errors - sometimes on reboot, sometimes while in IE.  Sometimes causes PC to shut down.

Help!

Answer : Memory errors and blue screen

test 1 stick at the time, in each slot with memtest86+  from www.memtest.org
if both sticks report bad, it can be the ram controller onboard.(= new mobo )
also check if the bad ram is not the Cache ram