Chssmius

I personally doubt this line of reasoning, but how about I unplug it and go to bed as it is almost 1:30 am for me and I have been troubleshooting this myself since yesterday.

Run as administrator has no effect.

Placebo confirmed I am reading it correctly and that the key is still good. I already tried restarting. Which registry entries? I just now did a manual search for such things and did delete a few arma 2 entries, but still no luck. EDIT: I also tried the installation with my anti-virus software and firewall off to no avail. Also, I am logged in with admin privileges with UAC disabled. EDIT2: This is the error I have been getting. In my frustration I was spamming the next button and found that doing so let me get to the next screen. To reiterate, from the image above (even without entering ANYTHING for a CD key) pressing the next button would continue the install (I haven't gone any further because this is 6 ways from Sunday fishy). I KNOW I have a good CD key and I KNOW I have gotten this thing to install before. So why is this happening?

I have the retail boxed copy of Arma II Combined Operations (Arma 2 and Arma 2: OA). I uninstalled it because I was having trouble getting a mod to connect to servers and thought a fresh install might help (uninstalled everything and deleted the Arma II folder that was left). Now I run the setup to reinstall it and it throws me a "Wrong CD Key" error when I try to get past the screen where you enter your key. I did some searching and saw where you could pm your CD key to Placebo to see if the CD key was legit. I sent him a PM about it (I hope that is still "the done thing"). I am running Windows 7 64bit, if that is important. For the system requirements, I meet or exceed all of the recommended requirements comfortably.