This is just the makers of that particular products way of making you buy their product. Don't be worried.
To Start with:
Do you have an up-to-date Anti-virus running? Do you have a Fire-wall running? Do you have any Anti Spyware installed and how often do you run it.
There are First Class Varieties of all of those available Free.
Once you have that organised that, there are many other pieces of Housekeeping Software that are available for Free. Each addresses another source of "Error" but most of these, so called, "Errors" make little, or No, difference to the operation of your PC.
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