let me list two sets of softwares(sorry i am not good in maths .what is 5?).hope u dont get angry.
(Also try http://www.anova.org/software/ , http://www.theopencd.org ,www.download.com,www.softpedia.com)
1)FREE SOFTWARES(some opensource)
a)AVG Antivirus(also try the non free versions)
b)Zone Alarm firewall(also try the non free versions)
c)Spybot search and destroy(anti spyware)
d)Adware(anti spyware,also try the non free versions)
e)Firefox ,Netscape ,Opera (popular alternative to Internet Explorer,with great free plugins,Opensource)
f)Openoffice ,Abiword (alternave to MS Office,Opensource)
g)Yahoo toolbar with anti spyware
h)Google/Msn desktop search
i)GAIM, Imvite, miranda, psi(multi messenger for Yahoo,Msn,Googletalk etc)
j)Gimp(similar to photoshop,opensource)
k)Mediaplayer,Quicktime,Real Player,Vlc Player,Mplayer(my favorites are Mplayer,Vlc)
l)DVDx(to convert different video formats)
m)DJBCP Codec Pack(to play all formats in your computer)
n)Programing
Activeperl(perl)
Codeblock(C++),python etc
o)7-Zip File Manager(more formats than WinZip)
p)Internet Download Manager,Getright(also try the non free versions)
q)AI RoboForm(automated password filler)(also try the non free versions)
r)Java runtime(incl with OpenOffice)
Non free softwares
a)Trillian pro(similar to Gaim)
b)Divx converter etc
c)Nero
d)Ulead DVD MovieFactory 3 Disc Creator(trail)
Free OS try linux disributions,freebsd.