Deleting files facilities previous windows, using disk cleanup will disrupt the performance of windows 7?

I have very little space on the hard drive (about 7gbts) and can win 9.3gbts by removing the previous installation files. However, I don't know if I can do it without the laptop unusable. Any solid info on the subject would be greatly appreciated.

Files left by previous installations are just a backup in case something does not work
work properly after reinstalling (resettlement "repair/upgrade") and they can be deleted once
you are sure that the system works properly.
You can also save the file to an external source like DVD (files can be moved
in the groups to separate from the DVD) or disk external DRIVE as an extra precaution.
.

Tags: Windows

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