Hard drive overloaded but I cant find with what

My problem is that when I check disk space on C partion in windows it shows that only 4,40 GB is free of 58,4 GB. I checked everything, but I cant find files which are big enough to fulfill this space. I installed WinDirStat. Picture is attached. After that I tried to check hard drive with scanner and with Disk savvy and situation is the same as with WIn DirStart, they see that only 28GB is used space. I don't if anyone have any other suggestion what is the problem and how I can find files which are responsible for fulfilling my hard drive?

Make sure Show unknown is checked in WinDirStat / Menu / Options.

If you have space used for <Unknown>, try Wiztree (free) to see if it shows where this space is used.
Antibody Software - WizTree finds the files and folders using the most disk space on your hard drive
They have a portable version, no installation needed.

Ty very much on quick answer and solution. I installed WizTree and found out that most of the hard drive is fulfilled with system volume information and than I limited in system protection disk space usage on 10% and that solved my problem. Ty very much one more time.

You're welcome and glad to hear you fixed it. :)
If you're using Avast anti-virus that might be setting your System Restore max space to 50%.

Yes, I am using Avast, so you helped me once more. Ty one more time, you are great. I am sorry that I cant do anything in return...maybe if you need some psychological advice, I am psychologist I can help you with that

We're all here to help when we can because we like to, and thanks for the offer

The problem is caused by the Avast Secure Virtual Machines tool.
You can uninstall it and see if that stops System Restore max space from changing.
Or, keep an eye on it and set it back to 10% as needed.

They are testing a BETA version of Avast now that is suppose to fix this problem.

Great! I will recommend this sevenforums to everyone.