I have a Dell Insoiron 530, one week old with a DSL connection. Computer was running fine and I installed a HP all-in-one scanner, printer, and fax. After I installed the PROGRAM my computer is running slower than dial up. I uninstalled the HP program and it is still running super slow. Any ideas on what I can do or look for?What operating system are you USING?
Have you installed any extra firewall protection?
Did the issue start a while after getting the computer? Or right when you installed everything?
What antivirus do you have?

Possible causes:
Unnecessary firewall options
Virus
Internet connection (check with your ISP)
Problem with your connection on your end (eg: router, modem, lines, cables) First: Check your cables make sure there is a filter on ever phone JACK in the house.

Second:check if any spyware download a good program for that (ex Ad-ware 2700) also get a virus scanner (EX: AVG,Avast!) check with those make sure you do not have anything.

If the problem still is going on CALL your ISP.
I agree with cowz, his recommendation on AVG or Avast is a great one. I use Avast myself and it's great. http://computermaintain.com has some great advise on how to keep your computer from running slow. From defragmenting to recommendations on programs to use to cleanup your computer.Pardon me if i've missed something from previous replies, but is it just your internet connection that's slow? or is it your pc?