You've linked WLM with Yahoo, then uninstalled WLM.
I think there is your problem.
Install WLM again then change your defualt email to yahoo!
I believe you're leading him down the wrong path. We need to get some facts straight here. The free Yahoo! Mail account is not a POP-enabled account; it is not designed to work with POP email clients. The paid Yahoo! Mail account, on the other hand, is designed to work with POP email clients.
By email client, I mean any software designed mainly for email, such as Outlook Express (came with Internet Explorer up through version, so was on all Win XP and previous versions of Windows), Windows Mail (comes with Windows Vista), Microsoft Outlook (usually bundled with Microsoft Office), and some non-Microsoft programs such as Thunderbird, from Mozilla.
Now, some uses of the free Yahoo! Mail account were able to get it working with Outlook Express by using a third-party add-on called YPOPS! but I don't recommend delving into that; it's not, in my view, a very reliable option and it's too complicated to setup for less technically oriented users. Besides, I believe the YPOPS add-on will not, or is very unlikely to, work with WLM.
To reiterate, the free Yahoo! Mail account does not, as designed by Yahoo!, work with any POP email client. So, when khill75462 says it was using his Yahoo! Mail account with Outlook Express, we need to know how that was setup since, again, the free Yahoo! Mail account does not, as designed by Yahoo!, work with any POP email client.
khill75462, if you want an email account that really works with WLM, then create a gmail account or use an account provided by your ISP (Internet Service Provide). Your ISP most likely provides POP-capable email accounts to all customers.
By the way, setting up a POP email account is WLM is easier than it was with Outlook Express. For example, if you create a POP-capable account by initially creating a username and password via a visit to a website, you can open WLM, enter your username and password, and WLM will search for other data it needs and complete the setup for you.