I want to reinstall Windows Xp soon, as I got a virus and after cleaning the computer doesn't work as smooth as before. I gives some strange erros and sometimes it justs hangs up... I want to backup Outlook Express emails and settings before reinstall, and restore afterwards. Any help?

sure.
their are lots of programs out there that just that. just do a search at google, majorgeeks, or download.com
by hand, u can only bakcup your email folders, that should be located on C:Documents and SettingsUSERNAMELocal SettingsApplication DataMicrosoftoutlook or C:Documents and SettingsUSERNAMEApplication DataIdentities