Freezing on Win7 Home Premium x64 with Flash Player 11.5.500.85

Question

I have the same browser freezing problem with both 11.4.402.278 and the 11.5 beta on two identical HP DV9700T Laptops running Windows 7 Home Premium x64.   Loading pages with flash cause the browser to hang.  If I kill the flash process the browser resumes.  Note:  When I am on a page with flash there are two flash processes in TaskManager.  I am using FireFox primarily, but the same freezing behavior is observed in IE.  So far, in IE, I have only seen one Flash ActiveX process.     Significantly older versions of of Flash work fine.
Both systems have AVG Free edition.  The problem still occurs when I "Temporarily Disable" the realtime scanner.  Both systems have nVidia video cards.  
When it freezes the cursor behaves normally, just the browser window is 100% unresponsive.  I can ctrl-alt-del to bring up task manager or I can use the Windows Flag (start)->Run   (yes, I have "run" manually turned on in my windows 7...I can't operate without it.)
Both systems have HP All in One Printer drivers installed as well as:  Office 2007, Media Player Classic Home Cinema set to default for all media types, 7-Zip, Adobe Reader, CCleaner, Spybot S&D, CDBurnerXP, Corel Paint Shop Pro X2 (12), Java, .NET, Various Visual C++ Runtimes, iTunes.     Those are all the common software programs.
Here are my system details in two different formats::
https://dl.dropbox.com/u/12937154/systemdetails.docx
https://dl.dropbox.com/u/12937154/systemdetails.pdf
This problem has existed with the last several versions of 11.x and it has become extremely cumbersome.  Let me know what other details you want. 

Answer 1

Jeromie,
antivirus/antimalware:
Microsoft Security Essentials:
     Antimalware Client Version:  4.1.522.0
     Engine Version:  1.1.8800.0
     Antivirus definition:  1.137.1188.0
     Antispware definition:  1.137.1188.0
     Network Inspection System Engine Version: 2.1.8600.0
     Network Inspection System Definition Version:  15.11.0.0
Malwarebytes Anti-Malware 1.65.0.1400
superAntiSpyware Professional:
     Program Version 5.5.1022
     Database Versin 9349
     Database Status - Updated 1 day ago last checked for updates 4 hrs ago
I added to new user accounts.
I'm not sure there is anything unique about my configuration.  Months before this problem, I would continually get the prompt that the most recent version of Adobe Flash Player needed to be downloaded.  I would download it but the message never would go away.  I do get this error every time I reboot:  Error in C:\Windows\system32\nvsvc.dll Missing entry:nvsvcStart.  I did notice these errors in Device Manager:  AGEIA Phys X100 Series PCI Express Card - this device cannot find enough free resources that it can use (code 12).  If you want to use this device, you will  need to disable one of the other devices on this system
and
Network Adapters - Microsoft ISATAP Adapter:  This device is not working properly because Windows cannot load the drivers required for this device Code 31.
I added two new user accounts, on the both the DLL error comes up.  Then it asks  to set up Internet Explorer 9 with the choices Use recommended security and compatibility settings.  SmartScreen Filter helps protect you from malicious websites and software by sending some web addresses to Microsoft to be checked.  ...  If I select this the problem occurs.  On the other new user account I did not check this and I did experience Internet Explorer pages that use Adobe Flash Player loading at a crawl.  Does this indicate SmartScreen Filter has issues or is having compatability issues with my antivirus\antispyware software?  I appreciate any suggestions.