I am running Win XP SP2, Avast and Windows antivirus, with a Linksys wired router. My speeds are so slow, I may as well go back to dial up. When I had a Motorola SB 4100 modem, I had great downloads speeds, never below 4-5 Mbps. I have since added Comcast Digital Voice and now have an EMTA, and the best download speed I have gotten in over a month is 2.7 Mbps. I've considered going to Comcast's speedtier due to the telephone, but I can't even get close to the normal service now. Any ideas on what I can do to increase my speed?