"I'm currently using XP and don't really want to change" - no you would not have to change from XP on your PC. Linux will run on the server at eukhost and you will have little interaction with it.
"How much of "wysifauthoring.informe.com" would I be able to keep ?" - informe.com belongs to someone else and they own all the 'sub-domains' including wysifauthoring.informe.com. However you will be able to buy wysifauthoring.com and/or wysifauthoring.co.uk, or pick another name that's not already owned.
With regard to forum software, phpBB are just about to release version 3. Once you have chosen your host it will be worth downloading the latest version and having a look.
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