blue screen error  

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: 1000007e
BCP1: C0000006
BCP2: 82E83F40
BCP3: 8B207BAC
BCP4: 8B207790
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\122110-15381-01.dmp
C:\Users\ESWAR\AppData\Local\Temp\WER-24975-0.sysdata.xml

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i cannot start normally i started with "optimized defaults" always ohter wise i cannot start my system n i cannot watch "you tube" also . i update my all drivers but i donot know what happen
" i want to back normal working with my system having win 7 "


plz help me give correct solution

Update your Conexant AVStream Video Capture Driver

Code:

BugCheck 1000007E, {c0000006, 82e83f40, 8b207bac, 8b207790}
*** WARNING: Unable to verify timestamp for pvavsvid.sys
*** ERROR: Module load completed but symbols could not be loaded for pvavsvid.sys

Dumps also blame atikmdag.sys, your ATI display drivers

- Boot into safe mode with networking
- Uninstall the ATI drivers including Catalyst Control Center
- Use driver sweeper to remove leftover ATI display driver files Guru3D - Driver Sweeper
- Install the latest drivers ATI Radeon
- Reboot into normal mode

Code:

BugCheck D1, {c, a, 0, 90f6ab81}

Unable to load image \SystemRoot\System32\drivers\dxgkrnl.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for dxgkrnl.sys
*** ERROR: Module load completed but symbols could not be loaded for dxgkrnl.sys
*** WARNING: Unable to verify timestamp for atikmpag.sys
*** ERROR: Module load completed but symbols could not be loaded for atikmpag.sys
*** WARNING: Unable to verify timestamp for atikmdag.sys
*** ERROR: Module load completed but symbols could not be loaded for atikmdag.sys
*** WARNING: Unable to verify timestamp for pvavsvid.sys
*** ERROR: Module load completed but symbols could not be loaded for pvavsvid.sys
Probably caused by : dxgmms1.sys ( dxgmms1!VidSchiUpdateContextRunningTimeAtISR+99 )