If your computer is running well, and you only have problems with internet speed, slow internet connections can be based on 5 factors:
1) Windows networking not running right.
2) Your modem is not connecting well.
3) Poor physical facilities in the phone lines or other equipment between your modem and the internet server of your target page.
4) Overloaded internet facilities.
5) Overloaded server at your target page.
Solutions:
1) Try Control Panel -> Network Connections -> Local Area Connection -> Repair This Connection
2) Reboot your modem. You may also have to check for a bad modem by trying someone else's modem to see if that helps your connection.
3) Nothing you can do about bad phone lines if you are in a rural area, except maybe to ask the phone company to come out to your house to see if the problem is in your house wiring. If your phone company also provides your internet service, complaining about bad connections may cause them to look for a bad connection in the phone lines outside of your home or elsewhere in town.
4) Try connecting in a low traffic time period, i.e., try not to use the internet at the same time as everyone else during the prime time of about 7pm to 11pm.
5) Also try off-peak hours in the time zone of your homepage or other page you have trouble accessing.