little help with game installation/two independent installs

[A#1]

i picked up a game "Viet Cong" at a yard sale the other day. my question is the game doesn't seem to allow multi profiles. can i install the game twice in two different folders in my program directory to allow different user settings and saved games, when i try the only option i get is to uninstall or play. reason being my son and i both like to play shooter games but on different skill levels and also with our own progress. i don't know if this is possible so i'm asking if anyone has tried this before. i have also installed the v1-01_US_only patch,v130 patch,v141 patch,v160 patch. i've searched google and haven't found a patch allowing multi profiles like in Viet Cong 2

tia

A#1