MN-500/520 and WEP

I've got an MN-500 and an MN-520. Everything was set up and working fine. I
ran an adware remover and now I can't get the base station and adapter to
agree on a WEP key, no matter how many times I've tried.

I was using the updat3ed MS Broadband Utility. I'm also running XP Pro.

Any ideas??