I have tried it without boost and there was no problem anymore! Thx! 
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i7 920 @ 2.67 MHz
12.0 GB RAM Kingston KHX1600
WIN 7 64 bit
SSD OCZ Vertex 3 120Gb
ASUS HD 6950 DirectCU II
Catalyst 12.6
Saitek Evo Force+Rudder pedals
TrackIR 5
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