there is of course a way to put settings in your registry that will allow you to right-click on a dll or ocx file and then click Register or Unregister fromt the context menu. However, for those of you who don't like messing with your registry (or don't know how) , here's a simpler way to register/unregister:
Just find your regsvr32.exe file and place a shortcut to it in your Windows SendTo folder. Then copy it and in the Target property of the new shortcut, append a '/u' (no apostrophes) to the end of the exe name. Then you can change the names of these shortcuts to "Register" and "Unregister". Then when you right click on a file, just use the SendTo menu to perform your dirty work!