|Windows Setup always sets up at least two users - Administrator and at least one other user.|
You can log on to the Administrator account only when you boot into Safe mode.
If your user does not have administrator rights, if you can boot into Safe mode and access the Administrator user without needing to use a password (or there is a password but you specified a password for it yourself), you can change your user settings so you do have administrator rights.
However, if someone else controls the Administrator user rights, such as when you are on a business or institutional network, they determine who has administrator rights and you need to know a password to log onto the Adminstrator user. There is nothing you can do about changing your rights in that case unless you know the password or the person in charge of the network Administrator user rights changes that for you.
If your user DOES have administrator rights, but your problem is you get access denied messages when you attempt to access certain folders or files
- you may have malware - that is frequently a symptom of fairly recent malware, especially the rogue anti-spyware/adware/virus ones that try to deceive you into scanning with their software and then buying their product to remove what was found.
- if you are trying to access some data that was previously set up on another system, or that was present before you re-loaded Windows and is still present, you may need to Take Ownership of the folders and files you cannot access.
However, if more users than just you (and Administrator) are accessing the computer, if the other users are using passwords when they log on, it is normal for you to get access denied messages when you try to access certain folders and files that are specific to their user.