Windows7 crashes inside the VM when starting a certain program

["André Weidemann" <Andre.Weidemann@web.de>]

Hi,
I am running Windows7 x64 in a VM which crashes after starting a certain 
game. Actually there are two games both from the same company, that make 
the VM crash after starting them.
Windows crashes right after starting the game. With the 1st game the 
screen goes black as usual and the cursor keeps spinning for 3-5 seconds 
until Windows crashes. With the second game I get to 3D the login 
screen. The game then crashes after logging in.
Windows displays this error message on the first crash:
http://pastebin.com/kMzk9Jif
Windows then finishes writing the crash dump and restarts.
I can reproduce Windows crashing every time I start the game while the 
VM keeps running without any problems.
When Windows reboots after the first crash and the game is started 
again, the message on the following blue screen changes slightly and 
stays the same(except for the addresses) for every following crash:
http://pastebin.com/jVtBc4ZH

I first thought that this might be related to a certain feature in 3D 
acceleration being used, but Futuremark 3DMark Vantage or 3DMark 11 run 
without any problems. They run a bit choppy on some occasions, but do 
that without crashing Windows7 or the VM.

How can I proceed to investigate what is going wrong?

I am using a qemu-kvm git clone from a few days ago 
(d58931037dbb4fbc2fbb33858629d3fabfd1b0d4).

This is my command line:
/usr/local/bin/qemu-system-x86_64 -boot order=ncd -cpu host -vnc 
192.168.3.1:0 -k de -smp 2,cores=1,threads=2,sockets=1 -drive 
file=/mnt/ntfs/Windows7_120G.img,if=ide,index=0,cache=writeback -m 4096 
-drive file=/dev/cdrom1,if=ide,index=3,media=cdrom,cache=none -device 
pci-assign,host=03:00.0,id=radeon6950,addr=0x11 -net 
nic,model=e1000,macaddr=DE:AD:BE:EF:42:42 -net 
tap,script=/usr/local/bin/qemu-ifup -rtc base=localtime -parallel none 
-soundhw hda -usb -device usb-ehci,id=ehci -usbdevice host:045e:00f9 
-chardev stdio,id=seabios -device 
isa-debugcon,iobase=0x402,chardev=seabios -watchdog ib700 
-watchdog-action debug -monitor telnet:127.0.0.1:11111,server,nowait,nodelay

Regards
  André