TomTom 3 will not install

[Golf_Juliet_Tango]

I know that this should be simple but...
New integrated PDA/GPS (it's the Mio)
Installed Active Sync on the PC and this communication is OK. I am running XP with SP2.
Put the TomTom CD in the drive, typed in the product key, did not want stuff connecting to the internet so selected option to block the internet connection and register the software later.
30 mins later became annoyed that this software was still trying to install, as I did not beleive that it could take that long.
Task Manager showed me that nothing was happening.
Aborted and went away for three days working.
Now that I have returned I tried it again, doesn't ask me for the product key or re-configuring COM1 (why would I want to use COM1 which is in use by something else?)
So - it won't install when trying to use the wizard.
Any suggestions? I did e-mail the supplier from whom I have had no response.
Thanks in advance for any suggestions.

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