That's because you are typing in the wrong password, you probably forgot what you set it as or typing it wrong.
Log on with another account that has admin rights on the computer, you can change your account password then. Gateway support can probably let you know what the administrator account/password is for your system. You can try to log on as user administrator, try no password.
Forgot the newly create windows password is common.
At the same time, the solutions is numerous
As I know the 4 methods:
1. Another valid administrator account which can normally log on.
2. A password reset disk or a repair disc, which is created in advance ( before you lost password ).
3. Third-party software to create a bootable password reset CD/DVD or USB, like Windows Password Reset Deluxe.
4. Re-install. Will lose data.