Step 1:Open up REGEDIT by going to START and clicking on RUN. In the box type:
regedit
And hit OK.
Step 2
Browsing the registry is like browsing your computer w/ Windows Explorer,
except there is one rule here: Don't change what you don't comprehend. Browse to the following position:
\HKEY_CURRENT_USER\Software\Valve\Half-Life\
Find the key named User Token2, right click on it and goto Modify. In the box containing what looks to be random numbers and letters [really an md5 hash of your password], highlight the gibberish and delete it. Do not type in the password you want here, it will not work. The password is stored as a hash value [which means no decoding] which you must encode first. I suggest just doing it in HL. Once you have deleted the hash click OK, then exit RegEdit. Congrats! You have removed content control.