The ideal situation is to
stop unwanted crap from getting onto your machine in the first place. FWIW, here are my suggestions:
1. Dump Outlook Express - many virii are written to exploit the OE address book. Use something like The Bat! (
http://www.ritlabs.com/en/products/thebat/) or Eudora;
2. Install some AV protection - AVG is good and free for home use (
www.grisoft.com);
3. Clean the other garbage from your system - SpyBot (
http://security.kolla.de) is good, as is AdAware (
www.lavasoftusa.com);
4. Dump M$ Internet Explorer and get a more secure browser. Mozilla Firebird (excellent browser IMO -
http://www.mozilla.org/products/firebird/), Opera (
www.opera.com), K-Meleon (
http://kmeleon.sourceforge.net/) are all preferable to IE.
5. Do
not open anything without: (a) knowing who sent it and why; and (b) checking it with your AV package.
It's a big rough internet out there, so take some precautions for your own safety

.