Help with setup

Help, it says "Windows cannot open the specific device file orp ath. You may not have the right permission to do so." What d oI do I installed it and now Im trying to run it (Unity 3.1 Setup)

http://www.brothersoft.com/unity-390341.html

Their is 2.6, you can try that...

Also, are you running it in a temp directory? If so, don't...

Also, is it on your main hard drive disk (Normally C:/)? Should be...

Are you running as administrator? Should be...

Maybe right click properties, and do a compatibility mode, and try it with some of those...

If none of these work, maybe someone more knowledgeable will be able to help... Hope I did a little.