NORTON ANTIVIRUS PROBLEM

Im trying to install norton antivirus 2005 but everytime i try to i get the following message:
" A NECESSARY FILE COULD NOT BE LOADED: NAVProd "
This is also causing me problems opening up HELP & SUPPORT as well as not allowing me to open certain internet sites such as Hotmail.
Im using windows xp. Can anyone help?

  h3z 17:11 29 Jul 05

have you checked the cd for scratches as one may have corrputed a vital file while installing

Ive checked the disk and it is scratch free

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