All I did when I left AOL (one of the best things I did I will add) was to first use the ADD/REMOVE PROGRAMS in the control panel.
After doing this I used the search feature and searched the computer for anything called AOL, after doing this I used CCleaner click here to scan the registry for left over AOL entries.
I also done the below, but you have got to be careful:
I opened up the regedit program that comes with Windows, once in here I went into its edit menu and choose FIND, a little window will open, in here I ticked ALL the boxes and entered AOL in the area where it says "Find what" next click FIND NEXT tab and wait for it to come up with the results/entries (if there is any that is), once you find an entry that you have determined is to do with AOL, then you can delete it, after you have deleted it click the FIND NEXT tab and it will continue the search through the registry until it basically gets to the end.
Has I have said, you need to be careful as you can cause serious problems if you mess up the registry.
YOU DEFINITELY NEED TO DO A FULL BACK UP OF THE SYSTEM BEFORE ATTEMPTING THIS, JUST IN CASE ANYTHING GOES WRONG!