Windows explorer crashes everytime i log into windows 7

Ok so i just did a update from windows vista to windows 7 and everything went fine untill i logged in....When i loged in the first thing that pops up is a windows explorer has stopped responding and the desktop is black nothing even gets a chance to load. This happens on any account and anytime i log in.... i can get task manager up and i ran defender to make sure there was no viruses and its clean. Im really anowayed and this is the message i keep getting:

Windows explorer has stopped working
windows can check online for a solution to the problem.

-->Check online for a solution and close the program
-->close program

Problem details:

Problem signature:
Problem Event Name: APPCRASH
Application Name: Explorer.EXE
Application Version: 6.1.7100.0
Application Timestamp: 49ee974f
Fault Module Name: kernel32.dll
Fault Module Version: 6.1.7100.0
Fault Module Timestamp: 49eeaac7
Exception Code: c0000005
Exception Offset: 0000000000003892
OS Version: 6.1.7100.
Locale ID: 1033
Additional Information 1: d8fd
Additional Information 2: d8fd8161e9ac0930383dc216f4c34d70
Additional Information 3: a87e
Additional Information 4: a87eb7be9617da7857e04259db193484
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If someone could help that would be great! its windows 7 the rc.

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