Windows7 RC.Go to Administrative Tools/Local Security Policy/Software Restriction PoliciesSet Security Level to DisallowedSet Enforcement : Apply s/w restriction policies to the following: choose ALL SOFTWARE FILESDo a reboot, and you only get as far as the logon screen. After logon, Windows Explorer will fail to load. My way out of this is to boot the installation DVD and do a system restore.

Windows7 RC. Go to Administrative Tools/Local Security Policy/Software Restriction Policies Set Security Level to Disallowed Set Enforcement : Apply s/w restriction policies to the following: choose ALL SOFTWARE FILES Do a reboot, and you only get as far as the logon screen. After logon, Windows Explorer will fail to load. Any luck in XP mode?

Also, this thread should offer the solution to your problem. http://social.technet.microsoft.com/Forums/en-US/w7itprosecurity/thread/2c78848d-2601-40d2-99c0-9b5c23b735e4

I already got my system working again thanks.The reason I posted the message is because this feature works in Vista, so it is a bug in Windows 7 RC.

I did a reinstallof Windows 7 RC in a virtual machine and reproduced the same result. And I got the error code and message:Title bar says "Explorer.exe" The dialog says: 'The application was unable to start correctly. (0xc0000005) Click OK to close the application"This occurs after login.