Problems with 64-bit systems

I have created an application in C# and tried to export for OS X, Win32 and Win64.

There was no problem.

I tested the OS X on mountainlion, all looks fine and work right.

Then I tested the Win32 version on XP (32-bit), all looks fine and all works right to.

Now I tested the Win32 version on Win7 (64-bit). The application seems to work right, but all graphics are fuzzy. Only the graphics which are loaded by a co routine are sharp.

The Win64 version on Win7 (64-bit) is also fuzzy and just some buttons work.

I developed with Unity 4 on OS X. All graphics are ARGB 32 bit formatted and the power of 2 is disabled.

Is there something I had done wrong or I had missed?

fuzzy normal

Thanks for helping.

[3]: http://answers.unity3d.com/storage/temp/6790-sharp.jpg