IE 7 stackhash errors and ntdll.dll could be involved

I've been experiencing annoying IE 7 crashes and they always happen within
seconds of downloading certain pages. I say "certain" since the crashes are
random but there are particular pages I absolutely cannot download due to
crashing. I've tried reseting IE, using 32 and 64 bit versions and using the
no add-ons option without success. Here are the two errors I see once a page
has crashed:

Problem signature
Problem Event Name: APPCRASH
Application Name: iexplore.exe
Application Version: 7.0.6000.16512
Application Timestamp: 46807103
Fault Module Name: StackHash_5255
Fault Module Version: 6.0.6000.16386
Fault Module Timestamp: 4549bdf8
Exception Code: c0000374
Exception Offset: 000aa0fb
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 1033
Additional Information 1: 5255
Additional Information 2: a75fd876183f6f3219cdd8086d3ff68b
Additional Information 3: 1290
Additional Information 4: 2f859cfcd8e695e2fa215d58a58dee19

Extra information about the problem
Bucket ID: 500417053

The fault module is either stackhash_5255 or stackhash_86fb:

Problem signature
Problem Event Name: APPCRASH
Application Name: iexplore.exe
Application Version: 7.0.6000.16512
Application Timestamp: 468076aa
Fault Module Name: StackHash_86fb
Fault Module Version: 6.0.6000.16386
Fault Module Timestamp: 4549d372
Exception Code: c0000374
Exception Offset: 00000000000c87b7
OS Version: 6.0.6000.2.0.0.768.3
Locale ID: 1033
Additional Information 1: 86fb
Additional Information 2: ce0b45749857407a119b2d97157ffcda
Additional Information 3: 15ea
Additional Information 4: 5cd266e99ed47a35fa336ef9850fdaf5

Extra information about the problem
Bucket ID: 567342

While viewing application error reports using event viewer I noticed a long
list of errors that were logged the same time I experienced the crashes with
IE but where the fault module name would be listed there is a file named
"ntdll.dll":

iexplore.exe
7.0.6000.16512
468076aa
ntdll.dll
6.0.6000.16386
4549d372
c0000374
00000000000c87b7
e48
01c8051ce132328b

All the IE errors in event viewer (63 in five days) display ntdll.dll in
this manner. I yahoo'd this file and found an interesting link to microsoft:


http://support.microsoft.com/kb/261317

I read the info at the site but vista isn't listed in the "applies to"
section. I do have a core2 duo so I'm thinking a fix for ntdll.dll might
apply to me. Does anyone have suggestions or a solution?

This is a crash in nvappfilter.dll , isn't it? Is that DLL on your system?
What does it do?

That looks like you have nvappfilter.dll on your system. Who made that
file, and why is it on your system? If you upgrade or uninstall that, does
the system then work properly?

'I think, therefore I Code...: [\"Windows Live Messenger\" or \"Windows
Media Player\"] has stopped working - APPCRASH / StackHash Error - Fix'
(http://tinyurl.com/2a2w7u)