0x641

Running xp media center pc trying 2 dwnld med. player 11, needed rollup2 4 mc
& .net 1.1 sp 1. Originally got 0x643 failure 4 both. dwnlded framewrk
cleanup, uninstalled .net framework 1.1 (still have 2), ran cleanup,
reinstalled 1.1, then tried 1.1 sp1 &now get 0x641 with Runtime error . Now
what? Could somebody please help, thanks.

ps was able 2 uinstall .net framework 1.0 sp 3 & reinstall