Deleted main applications support folder

I accidentally deleted my main Applications Support folder (Macintosh HD>Library>Applications Support Folder). How much trouble am I in? More specifically, what exactly does Application support entail? Many of the applications I've opened since seem unaffected, though I noticed my last roll of photos from iPhoto is missing from the application though they are in My Photos.
Thanks,
Travis

I also accidentally deleted my Application Support folder, but the User-Library_Application Support one. So my computer login is fine but all of my apps that used to "know me" don't anymore. Backup plans are gone, Quickbooks tells me it's a 15 day trial, and after talking with Apple tech support and unregistering and re-registering my computer, I have to re-type my .Mac password in System Prefs each time. I don't mind installing or re-registering my 3rd party apps, I just want to be able to keep my .Mac account name and restore from my "old" backups. I get the message, "another computer named "cathyheaton" is in use.

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