If you try to use
marvosym with MikTex, you might run in the following error:
Trying to make PK font umvs at 657 DPI... Running miktex-makemf.exe... miktex-makemf: The umvs source file could not be found. Running ttf2pk.exe... miktex-makepk: PK font umvs could not be created. Process exited with error(s)
But the solution is quite easy: just start a commandline and navigate to your MikTex installation. Then enter the bin folder and execute these commands:
Afterwards, everything should work fine.