Some of those items can be blocked by use of a HOSTS file:

A HOSTS file can block Internet access to thousands of known-bad sites by not allowing you any easy browser access to such sites knowingly or unknowingly. Use HJT to determine if a current HOSTS file exists and any contents therein:

• Run the HiJackThis tool and select ‘Open the Misc Tools section’.
• Next select ‘Open host file manager’ button.
• Use the ‘Open in Notepad’ button in XP/W2K or use WORDPAD if necessary [type wordpad.exe in the RUN box (Start>Run)] and load the FILE PATH identified in HJT.
• Go to http://www.mvps.org/winhelp2002/hosts.txt . # Read the initial instructions #. Copy and paste (append or replace) the RELEVANT host address entry contents of that file into Notepad or Wordpad and save the updated file contents.
  
  EXCERPT:
  #start of lines added by WinHelp2002
  # [Misc A - Z]
  127.0.0.1 phpadsnew.abac.com
  127.0.0.1 a.abnad.net
  127.0.0.1 e.abnad.net
  127.0.0.1 www.accoona.com #[Adware-Accoona][Adware.Atoolb][Panda.Accoona]
  .
  .
  .
  #end of lines added by WinHelp2002

Meanwhile, please ensure that your have run the 'READ FIRST Procedures' found here and post a HijackThis LOG if you are having continuing issues:

http://www.d-a-l.com/help/showthread.php?t=32403