I would actually suggest formatting the disk and start with a clean install. That way, you can add the applications you want one by one and simultaneously remove anything unnesessary from startup and autostart. And make the internet the final step, once an antivirus and/or firewall is installed. Any PC stuff, drives/updates needed, can be dowloaded with the Mac and burnt on a CD.

Rudolf Herczog
Digital Artist
www.rochr.com