*.dat files not working !

Hi,
My problem is that i am trying to play VCDs some of them WORKS fine using windows media player or power dvd, but others wont work, in widnows media player the error message is: incorrect function, and while trying on power dvd the PC just freezes, i took the unworking VCDs and tried them on win98 they worked fine, but it seems they dont like win2000, i made windows update and i tried many other softwares only win dvd was able to play them on win2000.. so many ppl are complaining about thisproblem but there is no solution i could find