OH i remember doing that quest... Uh, your doing the one in the Aylied ruin and the excavation right? I'm pretty sure it doesn't matter what kind of spell you use (touch or on target) so long as it hits the stone pillar thingy (don't remember exactly what you hit

it's been a while)
If your restoration skill isn't high enough then you could go around to the towns and try and find a fortify Magicka scroll.
Here are two magic stores that I know of that might have some scrolls to help you:
- The Mystic Emporium in the Imperial City Market and
- A Warlock's Luck in Bruma
Other then that i don't know, unless one of the mages guilds specialize in Restoration (Looked it up at uesp.net, it's Anvil) or the temple might help.
If worse comes to worse I suppose you could always just wander around all of the towns going to every store looking for a bloody scroll

.
Hope this helps. Happy hunting.