I've got two XP desktop computers and one Vista laptop computer connected to a Linksys router and then to Comcast internet through a cable modem. In the last few weeks the two XP computers have had difficulty loading web pages and often require several refreshes before a page is loaded. The problem is erratic and sometimes the pages load just fine. The problem seems to be independent of which browser is used and happens with both Firefox and IE8. On the other hand, Outlook 2003 works with no problems at all on both XP computers and other programs like Google Earth work normally. The laptop seems to work with no problems. I've changed the router and today exchanged the modem but the problem persists. Any help would be greatly appreciated.