Explorer Hangs at startup Win 7 ultimate 64-bit

[Kanny]

Explorer Hangs at startup Win 7 ultimate 64-bit and gives the following :


Problem Event Name: AppHangB1
Application Name: explorer.exe
Application Version: 6.1.7600.16385
Application Timestamp: 4a5bc9bb
Hang Signature: d5a7
Hang Type: 517
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033
Additional Hang Signature 1: d5a79239e366a8ebce3e8455d447cae9
Additional Hang Signature 2: e1cd
Additional Hang Signature 3: e1cd1deb3b469fa8f3aaba9d77c4f321
Additional Hang Signature 4: d5a7
Additional Hang Signature 5: d5a79239e366a8ebce3e8455d447cae9
Additional Hang Signature 6: e1cd
Additional Hang Signature 7: e1cd1deb3b469fa8f3aaba9d77c4f321

I have tried formatting, system restore, virus scan with Microsoft Security essentials..

 

[usasma]

Try this free tool: ShellExView - Shell Extension Manager For Windows

Disable all non-Microsoft extensions and see if that helps.
If it does, then do them in groups of 5 to 10 (rebooting in-between) to figure out which one it is.
Then uninstall the one that's to blame.