Unity Wont Install

Whenever i go to install unity. i get a NSIS error. i am runing XP and i have downloaded this 3 times, and am on my 4th time. I really need some help on this as it is getting to the point where i am going to give up on this all together. I have opened unity up with WinRar and it seems to me that every thing is there. Why am I getting this error?

http://download.unity3d.com/download_unity/UnitySetup-3.3.0.exe

Try that.

Might help...

I don't get why you're opening with winrar? It's an exe.

i have the same prob

having same problem

ok man definitly dont open it with win rar it may not install bc your computer doesnt have right graphics shaders/ card if you want send me the error message at fusmc7@gmail.com and i can try and fix it if not good luck