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LOIC/DoS attack

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Not 100% sure this is the right forum so I apologise in advance.

Late last night I posted an image in an open conversation on Skype, this followed by someone telling me my IP address and threatening to "launch" a DoS/DDoS attack against me. They then showed a picture of my IP address loaded up in LOIC and proceeded to ask me if my internet was "running smooth".

I wasn't too bothered at the time as nothing appeared wrong, so all I did was switch my router off and went to bed, woke up this morning and turned my router back on in hope that I would have been assigned a new IP. (which I was)

Like I said, had no problems at the time, but today I've noticed a couple of DNS errors when trying to load websites and my whole system seems more sluggish than usual.

Surely if he was successful I'd have no connection at all but I'm worried something else has been done and that good old Windows Firewall wasn't good enough to prevent it.

Any advice on how to check if anything malicious is going on? I've run Malwarebytes but no results.

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