What 32 bit OS are you using?
I have XP, Vista and Win7
In Win7 the Start Up folder can be found at C:/Users/username/AppData/Roaming/Microsoft/Windows/StartMenu/Programs/Startup
You may need to go to Folder Options/View and select Show hidden files and folders to see this folder. Then just create a shortcut to ObjectDock.exe and put it in there.
If that doesn't work try the instructions in THIS thread.