Do you have something targeted in the console? Sometimes that will mess up scripting commands. Look up at the top-middle of the screen when the console is open. If there's text up there then you've clicked on something and have it targeted. Clear that out before entering the console command.
If that doesn't work try the following:
Shum will occasionally fall off the bridge to Castle Skingrad and die. PC players who need him for either of his related quests can resurrect him with the following set of Console commands:
prid 0002C466
resurrect 1
enable
Edit: Just stumbled across the following from the Unofficial Oblivion Patch Notes:
- Shum gro-Yarug (Skingrad Count's butler) is now flagged as essential so won't die falling off the bridge, and if he's already dead in an existing game he'll reappear in Castle Skingrad County Hall.
So if nothing from above helps your friend could download and install the Unofficial Oblivion Patch and that should fix his problem.