need some help :) Options

[Rogan21]

Hey guys,dunno if i posted in the right section,but f*ck it still posting it.
I've wanted to do a fresh install of RtCW,all good until the end of the installation i got this god damned error:

Screenshot:

I installed the game from 2 iso files (platinum edition,also i've used the same images like forever),but suddenly this error pops out.Worst part even if abort that file's installation,won't be able to uninstall the game or even update it.Good part it's that i can play the game.
So if anyone knows a fix (plz not the argument with "buy the game on steam it's cheap" atm can't buy any games) please lemme know.