[help me] failed to execute game client

I am not able to run crossfire because of the error, failed to execute game client.
Crossfire worked fine back in April or so, I quit for awhile during the summer, and now I'm trying to re-install it.

I've tried re-installing several times using various versions of the crossfire setup file, but no progress. I'm using windows vista and I've tried running the program under admin.. i think...

PLEASE HELP MEEEEEE!!!!!!

Please give me something more than "just re-install it again", "restart your computer", etc.
I NEED A SPECIFIC RESOLUTION.

Thanks