OP, did you have any antivirus software installed? What was that?
If you didn't have, you should consider install one, even one of the free products.
If you did have, please share more details, since maybe there's a product or configuration others also have and it is inefficient.
Thanks for sharing this experience.
I do have antivirus which is Kaspersky Internet Security but it was disable because it blocks one of the bitcoin faucet that i always access to.