I am sorry to hear about your tough situation. I think you're blaming the wrong person for your woes, however. The "IT Guy" that set up your PC did a sloppy job and caused your problem, not Microsoft. That person should be helping you unlock your computer.
If that person is of no further help, assuming the laptop doesn't have any data on it that you care about, you can blow away the hard drive and reinstall Windows. If you're tech savvy, you can do it yourself, otherwise find somebody locally to help you. High level steps:
- Find a USB "stick" that is 8GB or larger in size.
- Plug in the stick and run the Windows Media Creation Wizard to create Windows installation media (That tool is here: https://www.microsoft.com/en-us/software-download/windows11).
- Note: You'll need a Windows 11 product key to activate Windows.
- On another laptop (maybe you can borrow a friend's), take the Make and Model of your laptop and go to the support page of that manufacturer and search for that model. Download all the drivers to a folder that you name as something like "Make Model Drivers".
- Copy that folder to the root of the installation media.
- Figure out how to boot your device from the USB stick (use your favorite search engine) and the Windows installation should start
- At one point the Windows installation asks you what drive to install to, at this screen you will choose every partition and then choose the "delete" option until you are left with one partition to choose that is unformatted.
- Choose that one partition that is remaining and continue the wizard
- At one point in the latest Windows 11 install, it will ask you to point to drivers, and you can point it to the root folder you created on the installation media.
- This should leave you with a fresh install of Windows that you can set up from scratch.
Hope this helps.