After reinstalling the operating system, various "tails" of the old version or the entire previous OS may remain. This usually happens if you do not format the partition before installation, or when the new OS is installed on another partition that did not previously contain the system. In any case, you need to get rid of old versions, because they can slow down your computer's performance and prevent it from working properly.
It is necessary
CCleaner, FreeSpacer or other registry cleaner, another PC, administrator account
Instructions
Step 1
Turn on the computer and start the new version of the operating system. If the new OS does not differ from the previous one and you installed it on the same partition, then the best way out is to reinstall the OS again, having previously formatted the partition. Otherwise, you must manually delete all files and directories containing data about past users. These are the Users or Users folders.
Step 2
Clean up the registry. For this, it is recommended to use special programs.
Step 3
If the OS was installed on a different partition, then find the Windows, Program Files and Users folders and delete them. If you can't access files from your computer, then insert your hard drive into another PC, start the system on it and delete all unnecessary files.
Step 4
Sometimes, after reinstalling Windows 7, there is a problem with access to files and directories. In this case, you need to set access permission or change the owner. To do this, open the properties of the directory, go to the "Security" tab, click the "Change" button and allow your user to do all the actions.
