W32.Alcra.b Virus-need help very fast and in critical condit

[coco]

the Alcra virus has blocked my registry editior. norton willl not delete this file. nortan has been updated and still wont. the UnHookExec.inf file was downloaded correctly and installed yet still the registry editor wont open. the registry window opens up with a screen with smiley faces. this virus is crashing my computer and i need to know how to free my registry editor. thank you very much. please reply soon

[Gecko]

Have you tried running from safe mode?
Reboot in to Safe mode:
Restart Windows after you see the BIOS screen and before Windows starts to load.
Start tapping the F8 key. The Windows Advanced Options Menu appears.
Use the Arrow key to ensure that the Safe Mode option is selected.
Press Enter. The computer then begins to start in Safe mode.

If that doesn’t work you can rename regedit.exe to regedit.com and then start it from the run box.
Go to My Computer->Tools/View->Folder Options->View tab and uncheck the box
“Hide extensions for known file types” and check the box Show hidden file and folders

If you would like me to help you get rid of this infection then please download , unzip it to it's own folder.
Start HijackThis and select 'Do a system scan and save a logfile'
Now post the contents of the logfile back into this thread