HDD usage is always 100 percent

My first PC is powered by a sandybridge i3-2100. I use it for casual internet browsing and web development but recently I’m experiencing so much lag and not responding messages. I can’t troubleshoot the issue as i dont have any spare parts to swap on. Here is the PC specs:
[ul]
[li]Intel i3-2100[/li][li]Intel DH61SA[/li][li]Zion 2GB DDR3 RAM[/li][li]Odesey 450W PSU[/li][li]Seagate Barracuda 500GB HDD[/li][/ul]
Whenever i check the task manager it shows that hard drive usage is 80-100 even if i have no applications running. When i scrolled down i noticed that a system service was using this but i was normal before. So tried reinstalling Windows, switched to Windows 8.1 anf even tried linux still its same.

What i think is that the PSU might not able to provide enough power as it is a less popular brand and a cheap one.

What do you think about this? What can i do to use this for web browsing again?

Increasing the RAM and changing to a branded PSU can help.

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I really suspect that PSU as sometimes its ok but sometimes it say there is no bootable device.

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[UPDATE]
I tried using my friend’s PSU but it’s still same. Can’t troubleshoot the issue till now! :sob:
Please help @Costa Gold @Abhiram Shibu @schoolster

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Try adding more RAM and check if the issue still exists.

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