Ive been having the same problem, you do need to have administration rights to download any software or hardware.
I have reinstalled soldat 2 times on administer account and it still wont work on my account. Saved in shared files. gawd, im annoyed.
EDIT: I found the problem.
Heres how to fix-
Delete soldat completely, all soldat files gone, done for...
Next you need to get the newest version of Direct X, all completly updated.
Reinstal Soldat, and you should have no problems.