Can you boot Windows up normally as an administrator, at least? If so, you will need to activate the built-in Administrator (it is, by default, hidden) to work in safe mode. This is because while the group of users who are administrators (including your own account) may be disabled, but the built-in Administrator account will always have full admin privileges.
Here's what you have to do:
1. Open the Start menu
2. Under the start search menu, go under All Programs -> Accessories and click on Command Prompt or search for cmd and click the first result
3. Type this method in: net user administrator /active:yes and hit enter
4. Close out of the command prompt and reboot Windows into safe mode
5. Log in as the now-visible Administrator account
If you have any further issues or cannot log in normally as an administrator, please let me know.