Browsers:

Microsoft Explorer - http://www.microsoft.com/windows/ie/default.mspx
Firefox (Mozilla) - http://www.mozilla.com/firefox/

Chat:

MSN - http://www.microsoft.com/msn/default.mspx
IRC - http://www.mirc.com/

Search Engines:

www.google.com
www.yahoo.com
www.snap.com
www.altavista.com
www.msn.com

Software:

www.download.com
www.tucows.com

Security:

Virus Protection:

www.symantic.com
www.macafee.com
AVG Antivirus (free) http://free.grisoft.com/ Recommended

Spyware Removers :

Ad-Aware (free) http://www.lavasoftusa.com/software/adaware/ Recommended
Windows Defender – Microsofts Anti-Spyware Software - http://www.microsoft.com/athome/security/spyware/software/default.mspx