You might like to look at this:

http://www.techmixer.com/remove-stor...windows-vista/

It should let you see what is actually still there?

I must point out that whilst you might have been able to use a stored password in the past; they can be both deleted or corrupted so they won't work anymore. Also, the password could have been changed on the site and not stored again.

I am not sure if restore points work for passwords, but suspect that they might not, as you would restore obsolete ones that are no longer valid, and lose ones that were stored more recently?

To be brutally frank, if I were using a dating site I would not:

1. Store a bookmark/favourite.
2. Store a user account ID
3. Store a password
4. Use one of my wife's computers.

In other words you are quite possibly looking for something that isn't there, particularly as you say:

we've had a issues with this in the past
As he knows that you know, perhaps he has been more careful?