AWKWARD ZOMBIE

Yeah, I've seen other people saying that Tumblr had virusues and such. I'm sorry if I overreacted, I was just trying to help!

Your helpful attitude is noted and appreciated.

Those are not virus warnings, that just means you have excess shit on your computer. Registry cleaners just help things go faster, clean out temporary files, and free up memory.

I don't think that scan even checks for viruses, does it?
"...errors that affect its performance" would have more to do with, like Dark said, simple incidental problems that crop up regardless of viruses; there's also no bar there that actually talks about viruses detected.

Oh, that's good then, I guess? I'm not too computer savvy, sorry. Yeah, I cleared out some stuff with another program it had. It's helped a lot.

If you want to fix those registry errors and stuff, don't bother with whatever AVG tells you to trial/buy, just download CCleaner for free and run it

CCleaner is great.