Drago494,
A friend of mind has the same problem about 2 months ago it seem to be Hijacking your computer somewhere in your HD, I managed to find it but I can’t stop the problem and delete it and it keep coming back some reason.
So I did it a very smart way and it work the problem has stopped for about a month, and I hate to say this and it going to be a very painful way for your PC to die!.
But first you must answer the following question.
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Do you have all the MS Window Update Critical Updates and Service Packs, I mean all of it 100%. Yes or No in past 6 months and keep on updating when ever MS tell you must install it.
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What firewall software do you have on your PC
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What protection software do you have on your PC beside your firewall and your Avast Anti-virus software.
Before I give you my painful answer to your PC and your problem will go way for ever