Why I can't use GTA 4 mods?

Hello!
Do you know something about “Err0x634hd23” in game?
I have this message every time I try to install mods in GTA 4
Why does it happen?

You’d best get help in a GTA-related forum than this, but I’m sure some people here would know. Not me, though, sorry.

There: http://gtaforums.com/ :dango:

what is a dango, wth

you can try reinstalling the game
… 20 times

Damn… That’s sweet.