My Checkout Without Account Mod

[craftzombie]

I've run across a possible problem when a customer revisits the site to purchase another product.

When a customer is checking out with the same email address they used the last purchase, it tells them that the email address they are using is already registered with the site and to login to complete the checkout process. How can they login when they don't have a password to login with?

It is only supposed to do that when they created an account the first time around. If it is doing that when they used "checkout without account" the first time around, then I would try re-installing everything because something may not have transfered properly. I have tested this several times on my own cart and have used the same email address on "checkout without account" orders at least 6 times in a row with no errors.