I ran Memtest overnight and no errors were found. I then ran a subsequest Memtest (all Memtest runs were allowed to run overnight), where 99999 errors were displayed. The third run resulted in 24897 errors. The fourth displayed ten errors. The fifth, no errors. I am at present running Memtest on a Toshiba Satellite A75-S206; it has ran for three hours but no errors have been located. I've used several versions of Memtest, all with similiar results. Can anyone tell me if this normally happens when using Memtest????