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deleting unused files

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after a crash I reinstalled windows but not a clean install. now I can not find old windowsfolder. I tried to delete old files. the computer says you require permission from trusted installer. can you please guide me how to delete


Operating system:Windows 7 Professional (64 bit) Service Pack 1

System root: C:Windows

Available physical memory: 6031 MB

CPU: Intel® Core i5-3210M CPU @ 2.50GHz

Drive Info:

C: 270.45 GB

D: 97.56 GB

E: 97.66 GB

Internet Explorer: 11.0

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You should usually find Windows.old in c:.

It is better to leave that folder there for some days/weeks, to recover your personal files.

Anyway, the simpler solution is to run cleanmgr; open an elevated command prompt and type:

cleanmgr /sageset:1 
Press enter, tick every option (or the options that you prefer) inside cleanmgr advanced menu, click ok, then type this:

cleanmgr /sagerun:1
Press enter and wait until it finishes.
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