Gary downloaded Linux and it seems to be stuck in the BIOS. He can't download Windows Update. Leo says that he can download multiple operating systems, but Windows can run into trouble when trying to dual boot from the GRUB Boot Manager. When uninstalling Linux, he may have run into issues of missing Grub boot features.
Gary will need to repair the master boot record, and he can do that in Windows. He can get into the Windows Recovery menu by booting up and tapping F8. Then he should look for BootRec.exe to repair it. This article from neosmart.net can help.