Programs randomly "not responding", need to know the cause and possible fix.

[KaTzEvans]

(I'm sorry if I posted this in the wrong thread, please tell me if I did... cuz I'm not even sure this is a CPU problem...)

As the title says, Everything just randomly freezes from time to time, and if I try to do anything the "Not Responding" label shows on the window. I mostly want to make sure whether this is a software problem rather than hardware, because from where I am, what I already have is considered as "very expensive" already and even I know it's not even a good rig...

To further it up, I've tried several of things like for software, I did: Defragmenting, Antivirus Scan, Malware Scan, tried those rootkit/adware cleaners, updated drivers, did some registry cleaning (CCleaner...), and CHKDSK scans.

And for hardware, I did: Cleaning the GPU Fans/Vents, CPU Heatsink, and the Motherboard.

I have also checked for errors in the Event logs, but nothing, no error logs were created whenever these freezes happened. I'm really worried that It's my HDD or CPU, as my HDD have about 300 GB worth of projects and my CPU is rather the most expensive part I currently have...

And a quick note about the "freezes" whenever one program freezes, then almost every program freezes along with it, mostly that gets frozen along with it are the system programs like sound, explorer, control panel, etc.

Please kindly give out suggestions or thorough explanations and such.
Thank you.

The video I was talking about that shows how the random not responding/freezes happen is shown here: [video="https://www.youtube.com/watch?v=Q3XmDnhaTUY"][/video]
(Please don't mind the background sound, someone was watching TV... and yeah, I'm highly aware that the video doesn't really help at all...)

 

[synphul]

What are your pc specs? Which cpu, how much ram etc. I noticed both your hard drives are getting close to full, that doesn't help matters. If you're low on ram (check task manager when doing this like you did in the video) then it could be slowing things down and too much transferring from the hard drive to the ram trying to do so many rapid things at once. I didn't see the program not responding in the video, just a 'waiting' icon. It could be a corrupt program file or operating system file if there are multiple programs 'not responding'. If it's just random programs doing it, I would suspect the os files. If it's one particular program or one particular group of programs they could be conflicting.

For example 'chrome is not responding'. Does this happen only when chrome is open? Does it rarely happen unless chrome and windows explorer are open together? Or chrome and twitch? If it was happening to the point where chrome was fine most of the time, but you encountered 'is not responding' when twitch is also running, there could be a conflict between those two programs.