Samsung i5700 galaxy portal - USB not recognised in win7

Just started using this phone - love having a smart phone, never had one before.

Using USB to connect it to PC won't work though - Just says USB device not recognised.

I have Kies installed and that Samsung phone studio thing.

I've toggled between USB debugging modeon the phone.

What can I do?

If I do get this working I want to upgrade android from 1.5 to whatever the latest version is. If I do that will I need to re-unlock the phone?

Also if I do a factory reset do get rid of data would I have ot unlock the phone again for that as well?

Cheers for the help guys.

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What OS do you have? Have you tried uninstalling kies and then plugging in the phone or loading the drivers manually?