Hi I'm just wondering how you wipe absolutely everything off the computer so you can start again with an older version of windows. I have a lot of old games and I'm wondering how to get rid of windows xp and windows 2000 and replace it with windows 95

Format the drive and with windows 95, you would need a floppy drive to boot from as 95 does not come in a bootable cd

Need more info on your end, what you have, what you have done

Errrr, it's highly likely you will NOT find Win 95 drivers for the newer XP compatible hardware that your machine has.
Also Games designed to run under 95 and 98 tend to use DOS4GW and are linked directly to the processor speeds, so they would be totally unplayable with modern hardware, WAY to fast.

You would be better off trying to find an updated version that runs under XP or trying Compatibility Mode.

Go to a goodwill or a off the map computer resale store. I promise you that will have computers for $50 that have Win 95 already installed in them. The hardware now is different from 95 and it won't be compatible.

This is a lot of WORK just to play a GAME!

If you want to play old games, go to:
VOGONS :: Index
It's the very old games network.
Search for your game there.
Also,
"Build on XP" - How to Play Build Engine Games Like Duke 3D on Windows XP
For ways to get your game working, as the info there works for a lot of games. Good luck!