Install Shield Error

[Error 1601]

every time I try and install this game i bought, Final
Fantasy 11 i get an error whihc says either in in safe
mode or there is something wrong with my windows install.
I dont know what to do. I would like to know if
reformatting would help. i was going to but now i cant
even find my code

 

[Taurarian]

The "Windows Installer Service Could Not Be Accessed" Error Message appears
When You Add or Remove Program
http://support.microsoft.com/default.aspx?scid=kb;en-us;315346

Windows Installer Fix (Line 94)
http://www.kellys-korner-xp.com/xp_tweaks.htm
Troubleshooting Windows Installer
http://www.kellys-korner-xp.com/xp_w.htm#xp_wininstaller

http://www.kellys-korner-xp.com/xp_w.htm
and scroll down to: "Windows Installer" - download and run the "WI.zip"
file.