Why reinstalling a computer is pain in the a*s

I just calculated that I need a tone of softwares that need to be reinstalled on my computer, that makes it a very time consuming process:

• Windows
• Firewall
• Antivirus
• Adobe Acrobat
• Print
• Firefox
• Chrome
• IE 8
• IE6
• Opera
• Safari
• MS Office
• Nero
• Macromedia
• Total Commander
• Adobe Photoshop
• codecs pack
• VLC
• Canon print
• IBP
• YM
• Skype
• Livezilla
• WinSCP
• join air
• RDS
• Open Office
• Ovi