Having Kaspersky internet security 2009 probs? Pc world says can't refund!

Please help!? Got kaspersky complete internet security yesterday, however could not download the updates from their website. Before I was sold the product, i could see that many people bought this product and i am sure they have been exeriencing probs and gone back to the store, regardless of which the staff still sold me a product that they are aware is having problems and they said you can't get a refund, as I have already opened it and used the product key and therefore no-one else can use this key , however their product doesn't work! They are trying to say the proct does work, but it's the online that doesn't work so i need to call kaspersky, whcih I did, but even they fobbed me off! Even I thought the product was too good to be true as it's half orice and it so is! Please help! Can you recommend which anti-virus sofware can be used with 3g mobile product, i heard that norton anti-virus slows down your computer, is this true?

Thank for all your help!
I am not getting an error message, it just won't update initially the databases from the server when you initially purchase it, as Kaspersky have said they are having server probs
 
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