I am the only user and administrator of my computer, nevertheless, I don't have permission to erase files, uninstall softwares, own objects and other things, how can I get full control?????

Hi, Would you please describe the issue in detail? What error messages were encountered? When did the issue first begin? What files could not be erased and what software could not be installed? Based on the current situation, I would like to suggest you disable User Account Control (UAC) to test the issue. If it does not work, I also would like to suggest you create a new administrator user account to test the issue. What’s the result? Regards,Arthur Li - MSFT