Windows – How to free disk space by deleting previous Window(s) installations

Step 1: Click on the Windows search bar or press the start key on your keyboard, type cleanup, then select Disk Cleanup.

Step 2: Click ‘Clean up System file’

Step 3: Scroll to, and select, Previous Windows Installations. Click start to begin the cleanup process which will include the removal of previous Windows installations from your disk.

This freed almost 30Gb on my disk. This, of course, means you’re unable to revert back to your previous Windows installation so proceed with that in mind. I found the disk space more valuable than holding on to the files.

Register ActiveX DLL or OCX Files on 64-BIT Windows

regsvr32 c:\WINDOWS\system32\WebAgent4.ocx
Screenshot 2015-06-17 13.52.17

 

If you receive an error when registering a 32-bit DLL or OCX on a 64-bit version of Windows, follow these steps:

 

1. Open an elevated command prompt – its important the command window has Administrator access otherwise you will continue to see errors:

 

in Windows Vista or 7:
Select Start > All Programs > Accessories
Right-click on “Command Prompt” in the Accessories
Click “Run as Administrator”

 

in Windows 8:
Open the “Quick Link” menu (by holding down the Windows 8 logo key  and pressing the X key)
Select “Command Prompt (Admin)”
Select “Yes” to allow changes

 

2. If the 32-bit DLL or OCX is in the %systemroot%\System32 folder, move it to the %systemroot%\SysWoW64 folder.

 

3.Run the following command:
%systemroot%\SysWoW64\regsvr32 <full path of the DLL or OCX>


In my example this would be: %systemroot%\SysWOW64\regsvr32 C:\Windows\SysWOW64\WebAgent4.OCX
Screenshot 2015-06-17 13.56.25


^Source: https://support.microsoft.com/en-us/kb/249873