t seems to be slower because you went back to WInblowz from a good OS LOL

But seriously... KNOPPIX could not/would not change your installed OS without the help of your fingertips.

"..... I could not put my computer into stand by ....."

What happened when you tried? Blue screen? Error mesages (if so which one)? What version of WIndows and Knoppix? Hardware? (specifically in this case Mainboard, RAM, CPU) .. Have you checked your Hard Disk(s) for errors..including a "Through" or Surface scan)..

Also you may try booting from the Knoppix CD again and choosing Memtest. This will run a series of tests on the RAM installed in your system... let it run for atleast a good number of passed (or overnight is better)

Take Care,
-Justin
One Mynds Eye