The latest Windows 10 update installed itself automatically two days ago and immediately began to cause problems on my PC. Any Excel file now takes 12-15 seconds to start, annoying enough since I use Excel a lot, but worse, Excel now routinely crashes with the loss of any unsaved work. Other Office components open normally, as Excel used to and other apps seem unaffected. Thinking it might be an Office problem I upgraded to Office 2019 but exactly the same thing happens. The update also seems to have disenfranchised my backup hard drive which now can't be contacted. Any help would be greatly appreciated.