I used Memtest+ 86 to check the ram and in test6 it found 3 errors. The test ran 4 passes. I've read somewhere that also incorrect ram voltage settings can produce this. But in Bios settings I have found where to change voltages but the only option I have is LOW, MID, HIGH and AUTO. It is on Auto at the moment but I can't find any information in Motherboard manual or on the net which seting to use. Ram operates at 1.8V which is specified from Apacer for this perticular memory modules. I would be grateful for any help. Thanks
In my experience, the only time voltage becomes the problem is when the RAM is overvolted too high. Since your sister's computer BIOS is set to [Auto], it isn't overvolting. The [Auto] range for DDR2 RAM is ~1.7, so you're ok there.
If you're getting errors in your RAM, they are very likely failing; stable at times, but failing.