Hi
You can probably do this in Windows by typing "msconfig" in the run window and going to the Startup Tab, but I like to use CCleaner to control my startup items.
Install it and go to tools and look through the "Startup" list.
Find anything that refers to Partition Magic and disable it.
You can't get into to trouble since you can just click enable again if you close the wrong thing.
CCleaner - Free software downloads and software reviews - CNET Download.com
Everyone should have CCleaner anyway! LOL
Also run the built in Registry Cleaner.
If that doesn't work try downloading EasyBCD, and see if that will let you get to it.
http://download.cnet.com/EasyBCD/3000-2094_4-10556865.html
Mike
Also...
How to Enable the Administrator Account
Open the command prompt with elevated privileges by clicking the Start orb, All Programs, Accessories, right-click Command Prompt and then select Run as administrator.
Type
net user administrator /active:yes
and then press Enter.
Log out and log back in as Administrator.
When you are done undue the process by doing the same thing and pasting in ….
net user administrator /active:no
This should let you get to the stuff that Windows doesn't want you to mess with.