Hi sheledin.
A big warm welcome to the eForum!
From the sounds of the error, it maybe that the account you are trying to install this on, isn't the administrator account. Can you confirm what account type you are logging into your PC as?
SP2 is the second service pack for windows XP. From time to time Microsoft release windows updates and service pack updates to the operating system to fix bugs and security holes etc. You would need to have installed SP2 as a minimum requirement.
If you right mouse click on my computer, and select properties. You can identify what service pack you are currently using.
My best suggestion would be to use a third party internet connection and install all windows updates that are outstanding.
All the best
BenJ_Vodafone
eForum Team
Vodafone UK