X server hangs in Debian squeeze after upgrade

[aux <aux@gawab.com>]

Hi, yerterday i did an upgrade of my debian squeeze, some packages of KDE4 and 
Xorg were upgraded. Since then my X server restarts when i move a window, 
visit a web or sometime when i move the mouse.

The log says:

Backtrace:
0: /usr/bin/X(xorg_backtrace+0x3b) [0x81314bb]
1: /usr/bin/X(xf86SigHandler+0x51) [0x80c1c61]
2: [0xffffe420]
3: [0xffffe420]
4: /usr/bin/X(WriteToClient+0x128) [0x8133b58]
5: /usr/bin/X(ProcGetImage+0x5bf) [0x808a6ef]
6: /usr/bin/X(Dispatch+0x33f) [0x808c79f]
7: /usr/bin/X(main+0x3aa) [0x8071ada]
8: /lib/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7be67a5]
9: /usr/bin/X [0x8070fa1]

Fatal server error:
Caught signal 11.  Server aborting

i have a nvidia  en7600gs video card. Also i tryed to upgrade nvidia driver 
but the problem continues


version of packages:
ii  xserver-common                       2:1.6.3-1                     
ii  xserver-xorg                         1:7.4+4                        
ii  xserver-xorg-core                    2:1.6.3-1+b1

nvidia driver NVIDIA-Linux-x86-185.18.36-pkg1.run

anyone help me?

thanks