Click on the Start Button (ORB) and select CONTROL PANEL

Make certain you are in CLASSIC VIEW (left hand Column) Double click on ADMINISTRATIVE TOOLS

Double Click on MEMORY DIAGNOSTICS TOOL

Click on RESTART NOW AND CHECK FOR PROBLEMS

The computer will restart and test the RAM in a DOS window. This will take anything up to an hour. When it is finished it will automatically reboot into Vista

When you are back in VISTA, it will report if there were any problems found or, as above, No memory errors detected.

If the system detects any problems remove all the RAM sticks and test one at a time. It is likely to be only one of the sticks of RAM and then please contact us for warranty/replacement