quickie regarding nocd/back up cracks and stability issues

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Hi all, and 4 those who know/remember me "im back "
Ok onto question. I seem to come up across the same problem every now and then. Here it is, I have two PCs and both meet all the required specs to play 3D games ect however one PC will run the games (Hitman 2, Battle field 1942, and now splinter cell) perfectly with nocd cracks for hitman 2 and 1942 and a backup crack for splinter cell but the other PC will NOT run hitman 2 when i use a crack, (i have used loads of different cracks for this game but the PC just dont want to know. It never gets past the loading screen and allways crashes back to desk top?. As for 1942 i can only get the game to run with a backup cd crack (cant remember witch one but the other PC runs it ok with a nocd and a backup crack) and splinter cell just wont run @ all with the backup cd crack that runs perfectly on the other PC. (confused yet ?).
ALL games run perfectly with out a crack and the original disks. Both PCs are running windows 98 second eddition. Its allmost as if some nocd/backup cracks work with one PC but not another. Also the PC that runs all the above mentioned games with the cracks wont run NOLF2 with the nocd crack but the other PC will . Is it the case if a crack works on one PC is not guarenteed to work on another PC? No smart remarks like " well use the PC that runs the games with the cracks" please.

@ RINCE. just to let you know the problems i was having with the driver updates for my geforce4 card are all sorted now, Thanks 4 all the help and info you supplied. The problem was my mother boards VIA chip set drivers it would seem. Once i Flashed the bios and updated the VIA drivers the stability/crashing/lock ups ect that allways happend when i updated my graphics card have stopped. No more 100s of E-mails from me to you and you to me Thanks again!