Windows 7 APPCRASH

Hey guys, i just installed Windows 7 32-bit yesturday and ive been trying all my programs.

My first problem was Windows live messenger.. it installed fine, and then i signed in and i got this message:
Windows live messenger has stopped working

Problem signature:
Problem Event Name: APPCRASH
Application Name: msnmsgr.exe
Application Version: 14.0.8089.726
Application Timestamp: 4a6ce533
Fault Module Name: StackHash_9179
Fault Module Version: 6.1.7600.16559
Fault Module Timestamp: 4ba9b21e
Exception Code: c0000374
Exception Offset: 000c2913
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033
Additional Information 1: 9179
Additional Information 2: 9179a2ebcb8612aef1b2bcf30a074dde
Additional Information 3: 532a
Additional Information 4: 532a9a5110ad600f9724db10b7bc701a

so i tried to uninstall and repair and it still didnt work... i tried to reinstall and it also did not work.
i read some forums and i tried turning off the DEP and it still does not work...
even worse i have the same problem for Internet Explorer and Limewire

It's worth noting that a StackHash crash is almost always a DEP crash, so if you've disabled it then whatever is causing the crash is probably just as buggy with or without DEP. Given it's affecting other software that uses wininet.dll (IE, LimeWire), I'd wonder if antivirus, or some other security software that has an LSP installed is causing it.

Get a crash dump of a process (preferably IE, as we can get symbols for that from MS), and perhaps we can tell you what's causing it.

The sibelius 7.1 application crashes and where would I find the reports re: application to send to vendor?