Discs/Partitions disappear from my computer

I am not surprised you have problems
It is not ONLY the OS - partition - lettered C - that is full to dangerous levels with hardly any free capacity
but also the other disks.

Have you written all this data to these drives - or is the lack of free space not accounted for in that regard
I do appreciate that you have explained why C is full - Wheels of Steel

So when you ask

How do I clean the disks of unnecessary programs when they disappear before my eyes!

that very much depends on the answer to the question I have asked.

Hello @Pablo89,

Pablo89 said:

How do I clean the disks . . .

There are a few ways to achieve this.

As a start . . .

> How to Open and Use Disk Cleanup in Windows 10

Then to see which Programs and Files are using your Disk Space . . .

 WizTree - Disk Space Analyser

About WizTree:

WizTree makes it very easy to locate and remove Space Hogs from your hard drive. The visual tree map displays the sizes of all of your files visually, helping you to quickly locate large files and folders.

When scanning NTFS formatted drives, WizTree reads the hard drive's Master File Table (MFT) directly from the disk (like Everything Search does). It can also quickly scan non NTFS and network drives.

Unlike similar applications, WizTree correctly handles hard linked files (doesn't count them more than once). The total allocated space reported by WizTree will actually match what Windows reports.

File details can be exported to a CSV file.

> Website => WizTree - The FASTEST Disk Space Analyser
> Download => Download WizTree - Includes Portable Version.

I hope this helps.