Win 10 compile problem

Windows 10 latest upgrade
IDE 1.6.9

When compiling I get and error "can't find C:\users.......\sketch_name"

The problem is now windows names things "ThisPC>Local C:>users...."

In preferences I can't seem to get ThisPC if front of the C:.

Any ideas on how to fix?

Thanks Ernie

Never mind, I wandered down the wrong path. One of the names in my folder was capitalized.