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I once vacuumed mine, and now I have to use a different one.
Where are the power settings? I only know about them in the display properties.
The computer was turned off for a while, it cooled down, and so far there haven't been any glitches (except for the multicolored numbers or something). Yes, it's probably just the video card overheating.
Added after 4 minutes:
1. I won't do that for now.
2. No.
3. I don't feel like it, maybe later.
4. Yes, I thought about that, but maybe I can just reinstall them.
5. Everything is fine.
6. I have Kaspersky installed, I checked it, although not completely. (I found one virus, but the glitches continued.)
7. I wrote about it above.
8. I don't think I need to clean it, and I don't want to do it again after the last time.
9. Pfft.