Massive loss of HD space after Win10 install.

You might have a directory on your main drive (mostly C:) called “Windows.old”. Maybe it is hidden, so you might need to enable hidden folders in Tools->folder options (or something like that).
In this folder you will find your old Windows Installation, if you upgraded to Windows 10 or did not delete your old Windows, Windows create this folder automatically.
You can delete this folder, if you do not need the files inside it anymore, but you won’t be able to switch back to your old Windows installation if you delete it.

BTW: I don’t think this is the right forum for this topic.

Woah, looks like a pretty cool feature……………………………………… however this will not urge me to upgrade my win 7 box :p

Already removed the Windows 8 installation. System is set to show hidden folders. Where would you propose I post topic?

A site that is specially for windows (I don’t know one, because I don’t use Windows), but that was just a thought.

People here seem more knowledgeable/helpful, so it seemed appropriate..

If you wanna free some space, you can also delete old backups that windows create when you install Windows updates:
Open a command prompt with elevated rights and use DISM to free space:

DISM.exe /online /Cleanup-Image /SpSuperseded

and

DISM.exe /online /Cleanup-Image /StartComponentCleanup

The first couldn’t complete. Second command netted about 700 mb. (Shrug) Better than nothing. Thanks :) I’ll keep poking around.

You can also clear the directory C:\Windows\Temp. Setup programs usually uses this to temporary store data when they decompresses themselves, but will not always clean it up. But there are some files you cannot delete, so you need to leave them there (Windows will give you an error message, if you try to delete them).

There is an equivalant directory in the personal folder. If you hit WINDOWS+R and type
%appdata%
and hit Return (or Enter), Windows will open an explorer window and you will see a folder called “Local”. In “Local”, you will find a second temp folder, which you can clear. Windows will as described above give you an error message for some files, but most files will be deleted.

What you can also try is to use some tools that shows the folder size of a folder to determine the “hd space killer”.

For cleaning my pc windows 8.1 i use this program https://www.piriform.com/ccleaner
You can use it for many purposes: you can find and delete windows logs, cache and cokyes of all browsers, even obsolete files. The first time i used it, it clean up about 1.5 GB of memory.
i hope this post will be helpful

[quote=TRYER]cache and cokyes of all …[/quote]

That’s sooo… wrong :p

Ty TRYER. As stated in op, I’ve already used Ccleaner..