I Recently Bought A Compaq Laptop From Pc World.it Has Windows Xp. I Contacted The Techguys.co.uk As Instructed To Get My Vista Free Upgrade,to No Avail.can Someone Point Me In The Right Direction On What To Do Next,how Do I Get This Free Upgrade To Vista??

Talk to PC World as they sold it to you.
Did it come with a FREE upgrade offer?