Router preventing some sites from loading

i have a new linksys router and its preventing me from going to parts of my email..such as the bulk folder or let me reply and ebay...it sometimes lags the internet...this happens even if i put the certain computer outside the firewall on the DMZ....can anyone help me out here???

Well if it happening even when you put the computer on the DMZ then it most likely is not the router. can you describe how you have it hooked up because there is a chance it could be hooked up wrong. ex. modem >>> (wan port) router (regular ports) >>> computer 1, computer 2, computer3.