computer not complete a system restore

My computer uses vista. I have succesfully completed system restores in the past, however now my computer will not complete the restore "d/t errors" The screen says " Cannot find wlidcli.dll.... reinstalling this program may help". When I x out of that screen it says windows live messenger not working, this too is a new problem. I called emachines and they said that for $100 (because my warranty recently ended) they could tell me a series of keys to hold down and fix the problem. Do any of you have other suggestions? I am computer capable, but I only fully understand the basics.

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