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Invariably, your PC will let you know!! You need to ensure you have an up to date Anti virus software installed and fully updated at all times. There are expensive items, cheap and free for this purpose on the web. Personally, I use Norton internet Security 2009 updated at all times. There are free versions of lower level security it depends what you want. The "MUST" is a. Install such software b. Have up to date at all times

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