Problem with vehicles

I’ve been having some trouble with all of the vehicles I’ve downloaded.
I’ve download VMod and the hoverboard and neither of them work!
And yes, I did put them where the creators told me to put them, in the addons and they still don’t work.
EDIT: Whoops, wrong sub-forum, sorry guys.

This is the right section.
What other addons do you have?

Something may be conflicting.

I don’t think anything could be conflicting with it.
Addons:
Adv Duplicator
Half-Life Renaissance
Hoverboard
Mario Player Model Pack
Extra Combine NPC Pack
PHX 3
Pikmin
Sonic Ragdoll Pack
Vehicle_Collection
Vehicle_Sound
Vmod
WireMod
WireMod Model Pack 1

And that’s it right now.
(Everything works except for the vehicles.)

Well gmow doesnt work for me.