OK, we'll try this a different way.
Quick try here, ok?
at the login screen, try cntrl+alt+del, see if we can't bring up the task manager.
At the task manager, hit "new task".
Type in "regedit"
If it lets you in, go to
hkey_local_machine\software\microsoft\windows nt\currentversion\winlogon
in there, over to the right, you'll see a dword named userinit
right click it, go to 'change value' or whatever and put in "userinit.exe" without the quotes.
Save it, restart, then follow my instructions from the begining of this thread.
If that doesn't work, Ill need you to get somewhere you can download and burn an .iso for us to fix this.