Yea I'm with Buenchico here. I get 100 spam emails a day, sometimes more. But when you check your emails with outlook express, it should just load up a big list of your emails, without actually loading the email content itself. You should just be able to highlight all the spam emails and delete them in one go, so it shouldn't take too long.
Mailwasher is here, it may be of some help:
http://www.mailwasher.net/
I haven't used it myself because I use Thunderbird which has its own effective spam filter, but it's a bayesian filter so wouldn't be that useful to you right now.