For the last week or so, when I try to scan with either an Epson all-in-one or an HP Flatbed scanner, I cannot select either, and the Select WIA source and Select TWAIN are both grayed out. I tried reinstalling but the problem persists.

For the last week or so, when I try to scan with either an Epson all-in-one or an HP Flatbed scanner, I cannot select either, and the Select WIA source and Select TWAIN  are both grayed out.  I tried reinstalling but the problem persists.