Maybe you could tell us what render settings you are using and what the specifications of your pc are?
OK problem solved...
The problem was that in the Project Properties / Pixel Format, I changed that to 32 bit and in Compositing Gamma to 2,222 (Video). That crashed my Rendering.
I changed that back to 8 bit and now I can render again..
---
Render Settings:
Audio
Mode: CBR
Format: Windows Media Audio 9.2
Attributes: 192kbps, 48 kHz, Stereo (A/V) CBR
Video
Mode: CBR
Format: Windows Media Video 9
Image Size: 1920x1080, Pixel Aspect Ratio - (1,000 Square)
Frame Rate (fps): 25,000, Seconds per keyframe: 10
Override default compression buffer (seconds): 10
Video Smothness: 100 (Sharpest)
Bitrate: Internet/LAN - 10 MB