Hi Amy
I am Dave, an Independent Advisor, I will help you with this . . .
There are a lot of versions of Update.exe, we need to find what software on your PC that belongs to
Open Task Manager (Ctrl + Shift + Esc)
Choose the Processes Tab and leave that open
When that Update.exe popup appears, on the Processes tab, find Update.exe, right click that and choose 'Open File Location'
What is the reported location of that file?