I agree regarding deleting the directory.
On installation, when asked to back up my files I said no, because I had already done that.
Then setup tells me it's going to create a windows.old folder.
Program Files, Users, and old your old Windows directories
Total size is 17GB with 62,800 files and 11,850 folders.
All I can say is look through the contents of all the directories and see if there is anything important you want to keep.. Your Program Files directory is useless as all programs need to be re-installed to created the registry entries. Basically all you can look for is documents, pictures, music, etc that you may have forgot about.
I checked the registry to make sure there were no references to it.
You can this command to take Ownership of the directory if you get any errors:
Copy and paste the info inside the quote into Notepad, choose Save As, then select All Files from the drop-down menu box and type in takeownersip.reg. Save it to your desktop and double-click on it to merge it intro the registry. this will place both Copy To and Move To to the right-click context menu for all files and/or folders.
Windows Registry Editor Version 5.00
@="cmd.exe /c takeown /f \"%1\" /r /d y && icacls \"%1\" /grant administrators:F /t"
"IsolatedCommand"="cmd.exe /c takeown /f \"%1\" /r /d y && icacls \"%1\" /grant administrators:F /t"
This will add a Take Ownership to the right-clck content menu and grant Administrator rights to your profile.