BSOD code: 0x000000d1 DRIVER_IRQL_NOT_LESS_OR_EQUAL

following is readout from blue screen view-

060212-13743-01.dmp
02/06/2012 18:57:01
DRIVER_IRQL_NOT_LESS_OR_EQUAL
0x000000d1
00000000`00000000
00000000`00000002
00000000`00000000
fffff880`0187bdd3
tcpip.sys
tcpip.sys+66dd3
x64
ntoskrnl.exe+7f1c0
C:\Windows\Minidump\060212-13743-01.dmp
8
15
7601
276,096

i got this BSOD today when attempting to play tropico 4. my system has been suffering from minor freezes during the day as well.

syst spec

fx-8150 @3.6
msi 6970
corsair vengeance 2x4gb DDR3-1333mhz 9-9-9-24
corsair force 3 120gb ssd
seagate barracuda 1tb HDD
win 6 home prem 64-bit

i have no idea what is causing this. im including an attachment of the dump and of the generated file from BSOD Dump & System File Collection app

I see Norton 360 installed and your crashes point to network related problems. There may be a correlation. I would recommend first to uninstall Norton 360 using the Norton Removal Tool. Then, download a fresh copy of Norton 360 and install it fresh. See if that resolves the problem; your Norton product may be corrupted.

If that does not work, use the Norton Removal Tool to remove Norton 360 again and replace it with Microsoft Security Essentials - Free Antivirus for Windows to test.

Also, if you are using the Norton 360 registry cleaner option, please stop.

• Many of us on the forums actually do not recommend automated optimization tools for Windows 7. Windows 7 does a much better job of handling its own optimization than its predecessors did. We especially do not recommend registry cleaning as an "optimization" step because automated registry cleaning causes more harm to the registry than it actually repairs.
  
  In the future, if you need help optimizing Windows 7, please post a thread in Performance & Maintenance - Windows 7 Forums or follow the tutorial enclosed in that forum to Optimize Windows 7.