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If you are installing Windows on a hard drive where Windows is already installed, and installing includes upgrading to Windows 8, you may end up with a Windows.old folder on the partition you have installed the new Windows version on. This is basically the Windows folder of the old installation which can be large in size. It may even happen that you have multiple windows.old folders on your computer. Windows distinguishes between those folders by appending a three digit number starting with .000 at the end of the folder name.
The Windows.old folder can easily be larger than 10 Gigabytes, and since it is usually not needed anymore, it makes sense to delete the folder and all of its contents to free up space.
Before you go ahead, I suggest you browse the folder once more to make sure that it does not contain any files that you may still need. This may include fonts that you have installed or any other type of file that you have saved into the Windows folder structure.
While you can theoretically go ahead and delete the Windows.old folder right away to free up the space it occupies on the hard drive, I'd recommend to use the built-in Disk Cleanup tool instead for the job. It is likely that it will also only delete the files on the drive, and while I have not seen any negative impact on the system after deleting the folder manually in Windows Explorer, I'd still suggest to use the Disk Cleanup tool instead.
You may sometimes run into access denied issues when trying to delete the Windows.old folder, which you can avoid with the cleanup tool.
Naturally there are other options to deal with the folder. You can boot from a Live CD and delete it or run Windows from the command line and delete it from there. Still, if you have access to a new version of Windows and can boot into it, I suggest using the Disk Cleanup tool for the process.
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A disappointing lack of detail here. The article makes no mention of the fact that windows.old also contains the old ‘Program Files’ folder and, perhaps more importantly, the old Users folder – together with all data files associated with the previous users.
A ME E’ CAPITATO,INVECE, DOPO AVER FATTO REINIZIALIZZAZIONE O REINSTALLAZIONE,DI AVER UNA CORPOSA CARTELLA W-HOLD DI BEN 25 GB , IL COMPUTER FUNZIONA REGOLARMENTE. MA SE ELIMINO LA CARTELLA HOLD, ANCHE DOPO UNA SETTIMANA,PER VERIFICARE CHE TUTTO VADA BENE, NOTO PROBLEMI DI RALLENTAMENTO DEL .S.O.. E QUALCHE INSTABILITA’. DOVE SBAGLIO,FORSE NON TUTTO CIO’ CHE CONTIENE HOLD ANDREBBE ELIMINATO…E SE SI COSA BISOGNA TENERE,POICHE’ IN EFFETTI L.OTTIMO SISTEMA DI PULIZIA DI W-8..SEGNALA VERSIONI PRECEDENTI ..BE, 24.5 GB…E PULIZIA FILESUPDATE QUASI UN GB…SI PUO’ FARE ANCHE LA PULIZIA DEI FILE UPDATE UNA VOLTA INSTALLATI’? CORDIALMENTE E GRAZI SE MI FARETE SAPERE. DR.ADAMO ADAMAS