Which Gimp 2.10.38 did you download ? Assume that it is the most recent gimp-2.10.38-setup-1.exe, although I have also tried the earlier version - both ok and start up without error.
Did you install anything else connected with Gimp 2.10 ? - a plugin for example.
The files that come with the installation are libtiff-6.dll and libnghttp2-14.dll both 64 and 32 bit versions as this search:
A bit of a search and maybe a gmic issue see: https://gimpchat.com/viewtopic.php?f=8&t=21568#p295219
Did you install anything else connected with Gimp 2.10 ? - a plugin for example.
The files that come with the installation are libtiff-6.dll and libnghttp2-14.dll both 64 and 32 bit versions as this search:
A bit of a search and maybe a gmic issue see: https://gimpchat.com/viewtopic.php?f=8&t=21568#p295219