I would like simple old-fashioned 3-D tetris. I have downloaded several updated versions but they couse computer conflicts and i end up deleting them. Where can I find tetris?

I hope this helps, here are some results of where you can dowload free versions of tetris.
tetris search

Try this site It has alot of Tetris clones and a few other puzzler type of games, and the best part of this is that it's all FREE!!!
Free Tetris and other puzzlers!!!

" I am the Holy wind that shall avenge the Cabal's victims" - Major Teroh