I understand that you are facing issues accessing the administrator account on your PC after a recent update. It seems that you are being prompted for the admin password whenever you try to install or run something as an administrator. Previously, you did not encounter this issue even though you were not the admin.
There could be a few reasons why this is happening. Here are a few steps you can try to resolve the issue:
1. Try the Default Administrator Account: Windows usually has a default administrator account that is hidden. You can try accessing it by following these steps:
a. Restart your PC and press the F8 key repeatedly until a boot menu appears.
b. From the boot menu, select "Safe Mode with Command Prompt."
c. In the command prompt, type "net user administrator /active:yes" without quotes and press Enter.
d. Restart your PC again and see if the "Administrator" account appears on the login screen. If it does, try logging in using that account and check if you can perform administrative tasks.
2. Use a Password Reset Disk: If you previously created a password reset disk, you can use it to reset the password for your administrator account. Here's how:
a. Insert the password reset disk into your PC.
b. On the login screen, click on "Reset Password."
c. Follow the on-screen instructions to reset the password for your administrator account.
3. Contact the Call Center Company: Since you mentioned that you bought the PC from a call center company, it's possible that they have implemented certain security measures that require admin credentials. In such cases, it's best to reach out to them and ask for assistance. They may be able to provide you with the necessary credentials to access the admin account.
If none of the above solutions work, you may need to consider reinstalling the operating system or seeking the help of a professional technician.