Day after day I meet people who know just enough to be dangerous with computers.

Watching a how-to on YouTube about building a PC doesn’t make you a technician.
It doesn’t mean you can give advice or start doing stuff for other people.

I recently had a customer come in looking for floppy disks.
I asked him why and he said “I need it to RAID my new hard drive”.
So that tipped me off he had no idea what he was doing.
Long story short he said he built the PC himself, and didn’t know if he was going to RAID 0 or 1 for better performance (for the record RAID 0 increases performance slightly, but at the cost of halving the life of the drives).
He had no idea you don’t need a floppy for RAID drivers on Windows 7.
He kept saying he already installed the “software from the CD” yet he hadn’t installed Windows?
This is the kind of dangerous I’m talking about.

I also meet people who are completely misinformed.

I keep hearing things like “registry defrag” or “clean out prefetch folder”.

If you don’t know what these things mean on a very deep level, please don’t help spread false information.

And for the record on that comment, registry fragmentation doesn’t affect performance, and clearing out your prefetch folder actually does more harm than good.