Daily PC shutdowns [help]

Hey everyone,
I've got this desktop setup at home

Intel Pentium D CPU 2.80ghz
2gb RAM
Radeon HD 4350
500gb

The thing keeps shutting itself down after being on for a little while
Yesterday it just died after about 20 minutes—I wasn't even doing anything significant
It basically dies the second I try to play a video
Not to mention how much it crawls when I try to run a video and open a heavy website at the same time

Attaching a screenshot here—maybe someone can make sense of this

Your PC is overheating
That's why it keeps shutting down
Looking at the photo, being under 93°C means things are getting way too hot for a computer just sitting idle

Honestly, I think you’ve really only got two ways to play this...

1: You could head over to a local tech shop—maybe a Best Buy or something similar—and grab a can of compressed air along with some decent thermal paste. It shouldn't set you back more than maybe $15 or $20. With the air, you can blow out all the dust until the whole rig is spotless—I mean everything, from the individual components to the heatsinks and fans. Then, just pop off the CPU cooler, use some isopropyl alcohol to wipe away the old, crusty paste from both the processor and the heatsink, and apply a tiny amount—just a little pea-sized drop right in the center. Put the cooler back on, and you're good to go...

2: Now, if the idea of opening up your machine makes you a bit nervous, you could always just take it to a local PC repair shop. It’s probably a fifteen-minute job for those guys to get it sorted, and they shouldn't charge you much more than what you'd spend on the supplies yourself. So, yeah... it's really up to you how you want to handle it.

First off, your CPU is overheating. You need to clean out the dust or upgrade to a better cooler.
Second, your power supply might be failing or was simply underpowered from the start. The voltage readings will tell you everything you need to know.
Buy a higher-wattage PSU. If you're planning on an upgraded graphics card down the road, you'll definitely need a much beefier unit.

Honestly, you can't go wrong with upgrading to a beefier cooler and a more solid power supply
Plus, you should definitely give the rig a good deep clean to get all that dust out and swap in some fresh thermal paste

Tore it down, gave it a deep clean—it was honestly disgusting in there after being an old relic for nearly eight years
Anyway, temps are back to normal now and it’s actually staying powered on🙂

Thanks, everyone!