Use the repair tool again long enough to get the Start Menu back again, then get to RUN and type
SFC /SCANNOW and press Enter
Have your XP cd handy as you will need it. This command will let XP repair or replace any system files that have either disappeared or have been corrupt enough to not be able to run. You will have to click OK each time the window says insert the cd as for some reason it doesn't realize the cd is still in the drive.
Once it's finished, reboot the computer, and get into SafeMode by pressing the F8 key a couple of times during the black and white bootscreen sequence, then go to Start/Control Panel and Add-Remove Programs and uninstall your Object Dock program from there.
Reboot the computer and once at the normal desktop, if everything is OK, try reinstalling the program. If you have the same thing happen again, you will know what the culprit is and uninstall it again until you can get some good tech advice from the people who wrote it about why it's not working correctly.
TONI