[Abuzeid]

الحمد لله تم حل المشكله والحل اهو عشان لو حد جاله نفس الخطأ بتاعي

The problem is Windows 8 you must install IVAP as Administrator and also disable User Access Control.
Best is not to install in C:\Program Files (x86)

Install in C:\IVAO\IVAP better yet if you have a second drive install it there D:\IVAO\IVAP

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Right click, properties, Compatibility and check Run this program as an administrator.
There are two ways to disable UAC, one via User Account Control Settings and the other one is via registry.
In my opinion, disabling it via registry it's more efficient.