The problem is that I currently lost the Boot Camp partition and don't know what to do. So, I manually restarted and tried to reinstall Windows 7. After that I created a bootable thumb drive using Boot Camp Assistant, but it didn't restart the system automatically. The Boot Camp Assistant said it cannot do it and I tried to delete the content myself from Disk Utility. So I tried to remove the whole thing from Boot Camp Assistant and reinstall a 64-bit windows 7.
I recently upgraded it to Windows 10 (followed Microsoft update message), but later after I saw some drivers are missing I searched and found out that Boot Camp doesn't support 32-bit Windows 10. I previously had a Windows 7 32-bit installed on my Mac using Boot Camp Assistant.
