I cannot use my Outlook 2003. I have constant message : Invalid Backweb Version 8.1.1.50-8876480SL Can any one shed some light on this? :(

You can unisntall backweb, it is generally used for HP pc's allowing there support to access your computer

Check info on this page about removal or disabling
Foistware: BackWeb (http://www.cexx.org/dlgli.htm)