Being an ex-work machine, it most likely was used to log into a domain, and thus would have had group policies imposed upon it. Those don't go away even though it's now at home.
The easiest way to blow away all those policies in one go is to use regedit, navigate to HKLM\Software\Policies, and delete the Microsoft key. If that doesn't get rid of them all, also go to HKCU\Software\Policies, and delete the Microsoft key from there too. Reboot to complete the task.
Caution: This could change a lot of settings, including things you don't expect. It all depends on what policies had been applied and you have become used to. Have a good think about it before doing anything. Also, Microsoft recommends backing up your registry before changing it.
Alternatively, you can run gpedit.msc, and examine the policy settings one at a time and decide which ones to undo.
Another place to look is under the Administrative Tools, Local Security Policy. There's interesting things in there.
If all that fails, there's a registry hack to force the machine to log into an account when booted up. I'll provide that if needed.