Windows Explorer (explorer.exe) crashed frequently and can not login to windows without change the path of explorer.exe

I tried to login to my Windows Server 2008 (R2 Enterprise) but always see this message:

 "Windows Explorer has stopped working"

and an APPCRASH event in Event Viewer.

I followed this guide here: 

 http://answers.microsoft.com/en-us/windows/forum/windows_vista-system/problem-event-name-bex64-application-name/1125d6bf-6481-4fe8-9b6d-a67e7f611fc6

to create a dmp file.

After using some WinDBG, i get:

STACK_TEXT:  
00000000`0022f2f0 00000000`ff5aaed6 : 00000000`00098480 00000000`8007000e 00000000`00000002 00000000`8007000e : explorer!CThreadRefHost::~CThreadRefHost+0x2c
00000000`0022f350 00000000`ff57b8d5 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : explorer!wWinMain+0xc50
00000000`0022fa00 00000000`76d1652d : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : explorer!DelayLoadFailureHook+0x208
00000000`0022fac0 00000000`76f4c541 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : kernel32!BaseThreadInitThunk+0xd
00000000`0022faf0 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : ntdll!RtlUserThreadStart+0x1d

I guess the problem is not from dll files because when i change the path of explorer.exe to something like: "C:\Windows\foo\explorer.exe", i can login and access folders, files.

I have no clue to solve this problem, can anyone help me?