Hi
Try this and see if your copy of Windows is Activated?
Is Your Windows 10 Activated? Here's How to Check
If it says yes then you don't need to buy a new copy, but you can download the install legally from Microsoft and reinstall it.
It will recognise that you are Activated, (your serial number is stored in the bios) and install a fresh copy of Windows 10 without all the manufactures junk.
Link Removed
Mike
PS, I see Neemo got here before me, anyway if your copy is valid then probable just fixing Windows will do the trick.
Use the Restore Partition, Download and Install a Fresh Copy or try Reset, myself I would get a fresh copy from Microsoft, "Create Install Media" and just have a nice clean installation.