CSS not loading in IE or FF

A client running XP SP2 cannot view web pages properly. No css loads in either IE6 or FF 1.5.0.7 or 2.0. I un-installed all Java and reinstalled. She has java and javascript enabled Also the View-> Page style is set to Basic Page Style. Ran Ad-aware, Spybot, HijackThis and full Avast scan and nothing changes. She does not use ZoneAlarm but rather the XP firewall. Since neither browser is properly rendering any page I am assuming that it is an issue with her box.

Any ideas as to what I can check to see what might be preventing the pages from redering properly?

Thanks heaps!