Re: Saves not showing in game
The standard Save location for ME is "C:\Users\>your user name\Documents\Bioware\Mass Effect\Save" (Normally "Documents\Bioware\Mass Effect\Save" in the Windows explorer.)
If you changed the location of the standard Windows "Documents" folder (Or if you use applications like "OneDrive" who might do that automatically.) this location is relocated accordantly.
If the save files are in this location try to run Origin and the "MassEffect.exe" as Administrator.