I have Dell Dimension 3000 desktop and a new Dell Inspiron 1520 laptop. Yesterday the laptop speed was 100.00 Mbps like my desktop, but now it is only 1 Mbps. My desktop is operating normally. I am running Windows Defender right now on my laptop. I used CCleaner to get rid of some junk. I removed unused programs. I reset the router Comcast provided me. It is a Comcast Networking Wireless-G Gateway made by LinkSys. Do you guys have any suggestions to get my laptop back to 100 Mbps?