This is a laptop outside of the network and you are trying to install as Unmanaged (Self Managed right)
seems like it has an earlier version installed and its corrupted
so, when you try to install this , its trying to uninstall that ( wont be able to coz its corrupted)
you first need to repair the existing install
2 ways of doing it
1) go to add / remove prograsm, do a repair of current install ( check the version)
it wil ask for network share, you need to select a valid source path which has that version source
this will repair it and later you will be able to do the instal as mentioned above
2) download this tool, run it, remove previous version, install the new one.
http://support.microsoft.com/kb/290301
will work perfectly, let me know if you have any questions'