Bluescreen intempestif windows 7

Bonjour,
Mon ordinateur (sony VPCF11SIE) donc une bonne bête, subit au moins une foi par semaine des bluscreen qui deviennent et pénible et dérangeant à la longue. Je précise que j'ai déjà overlocké mon ordi mais que j'ai tout remis à la normal (je ne sais pas si cela peut avoir une influence sur mon problème)
Voilà j'ai donc fait une analyse avec WhoCrased Pro pour que vous puissiez m'aider et remédier à ce problème. Je vous remercie grandement d'avance et voici les résultat de l'analyse :

System Information (local)
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computer name: LUCAS-VAIO
windows version: Windows 7 Service Pack 1, 6.1, build: 7601
windows dir: C:\Windows
CPU: GenuineIntel Intel(R) Core(TM) i7 CPU Q 720 @ 1.60GHz Intel586, level: 6
8 logical processors, active mask: 255
RAM: 6423650304 total
VM: 2147352576, free: 1936052224

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Crash Dump Analysis
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Crash dump directory: C:\Windows\Minidump

Crash dumps are enabled on your computer.

On Sat 12/03/2011 01:28:06 GMT your computer crashed
crash dump file: C:\Windows\Minidump\031211-31356-01.dmp
uptime: 18:58:05
This was probably caused by the following module: mod7700.sys (mod7700+0xB64C)
Bugcheck code: 0x1000007E (0xFFFFFFFFC0000005, 0xFFFFF8800E47B64C, 0xFFFFF8800E833AB8, 0xFFFFF8800E833310)
Error: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M
file path: C:\Windows\system32\drivers\mod7700.sys
product: DiBcom AVSTREAM BDA driver
company: DiBcom SA
description: DiBcom AVSTREAM BDA driver
Bug check description: This indicates that a system thread generated an exception which the error handler did not catch.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: mod7700.sys (DiBcom AVSTREAM BDA driver, DiBcom SA).
Google query: mod7700.sys DiBcom SA SYSTEM_THREAD_EXCEPTION_NOT_HANDLED_M

On Sat 12/03/2011 01:28:06 GMT your computer crashed
crash dump file: C:\Windows\memory.dmp
uptime: 18:58:05
This was probably caused by the following module: mod7700.sys (mod7700+0xB64C)
Bugcheck code: 0x7E (0xFFFFFFFFC0000005, 0xFFFFF8800E47B64C, 0xFFFFF8800E833AB8, 0xFFFFF8800E833310)
Error: SYSTEM_THREAD_EXCEPTION_NOT_HANDLED
file path: C:\Windows\system32\drivers\mod7700.sys
product: DiBcom AVSTREAM BDA driver
company: DiBcom SA
description: DiBcom AVSTREAM BDA driver
Bug check description: This bug check indicates that a system thread generated an exception that the error handler did not catch.
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: mod7700.sys (DiBcom AVSTREAM BDA driver, DiBcom SA).
Google query: mod7700.sys DiBcom SA SYSTEM_THREAD_EXCEPTION_NOT_HANDLED

On Wed 02/03/2011 13:46:53 GMT your computer crashed
crash dump file: C:\Windows\Minidump\030211-31793-01.dmp
uptime: 1 day, 15:53:05
This was probably caused by the following module: afd.sys (afd+0x243A)
Bugcheck code: 0x3B (0xC0000005, 0xFFFFF8800483843A, 0xFFFFF8800AE70A50, 0x0)
Error: SYSTEM_SERVICE_EXCEPTION
file path: C:\Windows\system32\drivers\afd.sys
product: Système d'exploitation Microsoft® Windows®
company: Microsoft Corporation
description: Ancillary Function Driver for WinSock
Bug check description: This indicates that an exception happened while executing a routine that transitions from non-privileged code to privileged code.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system which cannot be identified at this time.

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Conclusion
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3 crash dumps have been found and analyzed. 2 third party drivers have been identified to be causing system crashes on your computer. It is strongly suggested that you check for updates for these drivers on their company websites. Click on the links below to search with Google for updates for these drivers:

mod7700.sys (DiBcom AVSTREAM BDA driver, DiBcom SA)

If no updates for these drivers are available, try searching with Google on the names of these drivers in combination the errors that have been reported for these drivers and include the brand and model name of your computer as well in the query. This often yields interesting results from discussions from users who have been experiencing similar problems.

Read the topic general suggestions for troubleshooting system crashes for more information.

Note that it's not always possible to state with certainty whether a reported driver is actually responsible for crashing your system or that the root cause is in another module. Nonetheless it's suggested you look for updates for the products that these drivers belong to and regularly visit Windows update or enable automatic updates for Windows. In case a piece of malfunctioning hardware is causing trouble, a search with Google on the bug check errors together with the model name and brand of your computer may help you investigate this further.