BSOD New installation - windows updates

Please uninstall Avast while troubleshooting
Avast - Uninstall Completely

Code:

*** WARNING: Unable to verify timestamp for aswSnx.sys
*** ERROR: Module load completed but symbols could not be loaded for aswSnx.sys

Lets keep this in mind.
The tcpip.sys driver is related to the network, this could mean the network drivers or a 3rd party driver connecting to the network is causing issues.
If uninstalling Avast doesn't help much, a next step would be to update the network drivers.
Driver Reference Table - netr28.sys
Driver Reference Table - Rt86win7.sys

Code:

8a997cfc  88ce6013 tcpip!TcpUpdateBacklogTcbSend+0x155

0: kd> lmvm netr28
start    end        module name
940e5000 94186000   netr28     (deferred)             
    Image path: \SystemRoot\system32\DRIVERS\netr28.sys
    Image name: netr28.sys
    Timestamp:        Fri Sep 11 07:20:24 2009 (4AA9DE18)
    CheckSum:         000A3142
    ImageSize:        000A1000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4
0: kd> lmvm rt86win7
start    end        module name
94083000 940e5000   Rt86win7   (deferred)             
    Image path: \SystemRoot\system32\DRIVERS\Rt86win7.sys
    Image name: Rt86win7.sys
    Timestamp:        Fri Jun 10 08:31:55 2011 (4DF1BA5B)
    CheckSum:         0006A77B
    ImageSize:        00062000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

Please uninstall Avast again and use Microsoft Security Essentials as alternative.

How many updates are there currently?
I recommend to first read their description so you are aware of any changes they make.
Also, before installing always backup first and install them in phases.

What are the 4 updates for Windows specifically doing?
Please post the KB nummers.