This isn't the right place for you to put your DeviantART help needs. You should take that up to DeviantART itself instead of FeralHeart, thank you.
If you mean you get actual viruses from DeviantART, then: Don't go on, don't click the ad's and/or put up a sort of security program for your device.
If you mean you get ad's talking about having a virus on your computer, ignore them. Those things aren't accurate, they're just ad's.
I don't think you have a virus.
I get pop-up's every once in a while that make sound and I'll close it and I'll still be fine with 0 threats eto my computer.