It may be a lazy way to do it but as a user of Aol 7 and one who can't resist meddling with my computer, I occasionally upset things - bigtime!
Aol to its credit, has the best re-install of anyone...... The way I do it is on a desktop where nothing else is running pop the Aol disk in the slot and follow the prompts.
Accept the option as an existing customer wishing to upgrade on this computer.
Then you have the option to copy, duplicate or move existing files. I use - copy.
If Aol finds several installations it will give you the chance of saving the latest lot of settings and so on.
Five minutes and you are back in business... none of the Microsoft nonsense about accepting a file because it is there, .. regardless of whether it is corrupt on not.
Of course all this assumes that your modem is OK, it most probably is, modems usually either work or give up totally.