Cannot open hard drive by double clicks

From TechTalkz.com by bakuryu:

"1. Run Task Manager and go to the Process Tab.

2. Stop wscript.exe process if available by highlighting the process name and clicking End Process.

3. Then terminate explorer.exe process.

4. In Task Manager, click on File -> New Task (Run…).

5. Type cmd and click OK.

6. Type the following command one by one :

del c:\autorun.* /f /s /q /a
del d:\autorun.* /f /s /q /a
del e:\autorun.* /f /s /q /a
del f:\autorun.* /f /s /q /a
del g:\autorun.* /f /s /q /a
del h:\autorun.* /f /s /q /a

7. Again in Task Manager, click on File -> New Task (Run…).

8. Type regedit into the Open text box and click OK.

9. Navigate to the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
and check the value of this key : Userinit.
The correct value of this key will be :C:\WINDOWS\system32\userinit.exe,
assuming your Windows is installed on the C drive. If the value is incorrect correct it to value mentioned. Note the trailing comma is necessary.

10. Close registry editor and cmd. Then go to : Task Manager, click on File -> New Task (Run…), type in explorer. It will restart the explorer process. Now try opening your drives."