If clicking Remember Password/Remember Me does not work, then your browser itself may not be allowing cookies from this site. Click Start -> Contol Panel -> Network and Internet -> Network and Sharing Center -> Internet Options -> Privacy. You can either adjust using a slider or you can allow cookies from specific sites. To do the latter, click Sites then enter the PC URL. I do not recommend allowing all cookies nor disallowing all cookies. Sometimes when there is an update, certain settings can be adjusted and it gets rather irritating or the VBulletin forums itself had a particular change. Additionally, if you have a program for Internet security or firewall, sometimes they can cause very odd results by blocking a non-malicious site for seemingly no reason.