For what its worth, Im running V7.77, and I get most of the errors in my log too,
but MED is actually working fine.
The only one that is different is "load dll: med_plugins\WmpImporter.dll"
It loads OK for me as follows
load dll: med_plugins\WmpImporter.dll
full name: <G:\GStudio7\med_plugins\WmpImporter.dll>
add action: "wmp_import" [h=39(39) fl=0 typ=3 vid=0,exec=01761104]
and thats the last entry in med.log.
Hope this helps somehow...