I want re-format my PC, how do I back up my itunes before I format. The same PC is also used to back-up my iPhone4

Hi all,
Hope you can help.
I have a desktop PC which I want to reformat and reinstall Windows XP because I think I have a virus on it, I have also had the PC for 5 years and never done this opperation but I feel I should now.
I have also backed up my iPhone4 on the same PC (the one Itunes library its backed up on)
1. How do I back up my itunes onto an externall hard drive
2. How do I make sure that my iPhone will re-sync with Itunes once I reinstall Itunes on the PC after the format (ie I dont want to see that message that iPhone can only sync with one  iTunes library)
3. Before I format the PC do I have to de-authorise my PC?
4. Once I reinstall windows XP and iTunes how do I make sure the my iPhone will recognise the itunes library so everything will sync again (ie. music, all, movies purchased items etc
5. Basically I want to reformat my PC and when I reconnect my iPhon/e it will be the same as before.
6. Are there certain files within the iTune folder that I need to vack-up
Hope somebody can help, as im a novice with Itunes and Apple based softwear.
Thank you in advance
Bhav P

Backup the library with this User Tip.
Deauthorize the old computer as you no longer want to access protected content on it.
Restore the backup to your new/rebuilt computer using the same tool used to back it up, ideally before installing iTunes.
Keep your backup up-to-date in future.
tt2

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