Windows 7 - Not Starting Properly - Help Please

Doing the sticky key trick to get the CMD to open worked!

I ran sfc /scannow.

It stops at 91% every time. Here is the relevant log entry:

014-04-11 12:50:41, Info CSI 00000ba4 [SR] Beginning Verify and Repair transaction
2014-04-11 12:50:41, Error CSI 00000ba5 (F) STATUS_OBJECT_NAME_NOT_FOUND #25279835# from Windows::Rtl::SystemImplementation:irectFileSystemProvider::SysCreateFile(flags = (AllowSharingViolation), handle = {provider=NULL, handle=0}, da = (SYNCHRONIZE|FILE_READ_ATTRIBUTES), oa = @0xcec710->OBJECT_ATTRIBUTES {s:48; rd:NULL; on:[114]"\??\C:\Windows\WinSxS\x86_microsoft-windows-security-credssp_31bf3856ad364e35_6.1.7601.17514_none_c5bf9b5affd21ddc"; aOBJ_CASE_INSENSITIVE)}, iosb = @0xcec6f0, as = (null), fa = 0, sa = (FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE), cd = FILE_OPEN, co = (FILE_SYNCHRONOUS_IO_NONALERT|0x00004000), eab = NULL, eal = 0, disp = Invalid)
[gle=0xd0000034]
2014-04-11 12:50:41, Error CSI 00000ba6@2014/4/11:16:50:41.669 (F) d:\win7sp1_gdr\base\wcp\sil\merged\ntu\ntsystem.cpp(2057): Error STATUS_OBJECT_NAME_NOT_FOUND originated in function Windows::Rtl::SystemImplementation:irectFileSystemProvider::SysCreateFile expression: (null)
[gle=0x80004005]
2014-04-11 12:50:41, Error CSI 00000ba7 (F) STATUS_OBJECT_NAME_NOT_FOUND #25279834# from Windows::Rtl::SystemImplementation::CDirectory::OpenExistingDirectory(...)[gle=0xd0000034]
2014-04-11 12:50:41, Error CSI 00000ba8 (F) STATUS_OBJECT_NAME_NOT_FOUND #25279833# from Windows::Rtl::SystemImplementation::CDirectory_IRtlDirectoryTearoff::OpenExistingDirectory(flags = 0, da = (SYNCHRONIZE), oa = @0xced008->SIL_OBJECT_ATTRIBUTES {s:40; on:"x86_microsoft-windows-security-credssp_31bf3856ad364e35_6.1.7601.17514_none_c5bf9b5affd21ddc"; aOBJ_CASE_INSENSITIVE)}, sa = (FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE), oo = (FILE_DIRECTORY_FILE|FILE_SYNCHRONOUS_IO_NONALERT|FILE_OPEN_FOR_BACKUP_INTENT), dir = NULL, disp = Invalid)
[gle=0xd0000034]

EDIT: Removing my password and choosing auto-login in registry did not fix this problem.

EDIT: In terms of services when I am stuck at the Windows welcome screen, everything looks normal except i) there is application "Windows Logon" , ii) there is process "LogonUI.exe", and iii) there is no explorer.exe.

EDIT 2: If I manually start explorer.exe, I can press alt+tab to switch between the desktop of user "system" and the "Windows Logon" screen (the later just shows the wallpaper).

At this point, my advice would be booting from any Live CD, recovering your data, then reinstalling windows. After hitting problems like this, even if you manage to fully recover it, something went awfully wrong with it, and it might again.