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You can manually reset the ownership of the C drive but it might not fix the issues with downloading and installing software.

Perform a ‘System Restore’ to undo the changes made to the system if it was working fine before you made them.

1. Click ‘Start’ and type ‘restore’ in the search field.
2. Click ‘System Restore’ when it shows in the list of options.
3. Follow the instructions.
4. The system would restart automatically. Once it does, check if the problem persists.

If it does, enable the default administrator account:

1. Click Start, type ‘cmd’ in the search field, right click cmd from the list above and choose ‘Run as Administrator’.
2. In the ‘Command Prompt’ window, type the command ‘net user administrator /active:yes’ without the quotes and press enter. This enables Windows 7’s default Administrator account.
3. Restart when prompted.
4. The system will automatically restart in normal mode and you will see an option to login to the ‘Administrator’ account (which you just enabled).
5. Check if it works fine.

If you do not want to keep using this default Administrator account, you can follow these steps to create a fresh one.

If you do not want to keep using the default Administrator account, you can create a fresh one:

1. Go to ‘Control Panel> User Accounts’ and create a new account. Name it something similar to the affected one (not exactly the same though) and select ‘Administrator’ for the ‘Account type’.
2. Restart and log in to this new account.
3. If it works fine, you can transfer the data over to the new account by copying the folders in C:\Users\*old user name* and pasting them in C:\Users\*new user name*. Click to ‘merge files’ when you get the prompt.

This would transfer all the data from the old user account to the new one. Once you are convinced that everything has transferred over, you can delete the old user account from ‘Control Panel> User Accounts’.

You can then disable the default ‘Admin’ by running the command ‘net user administrator /active:no’. Hope it helped.

Here’s to Good Karma