OS Yosemite - My Apps wont "open"

Hi I'm Katrina and i'm running iMac - Late 2009
Duo Core
3 TB Hard drive (upgraded)
12 GIG Ram
OS Yosemite (upgraded when it was released)
I am unable to open any of my system APPS
App Store.
Mail
iMessages
Facetime
Calendar
Contacts
iBooks etc etc (please see print screen with highlighted non working apps)
when I click on the Apple logo in the top left and Go to the "About this Mac" - It won't come up either.
- anything external functions "Normally"
The other day I was going thru my iMac and deleting some my files "movies, music and duplicates" I deleted a folder in my mac that was from when Parallels was installed on here ages ago. with the "Windows" files in it.
anyway... I finished work that day. I shut down my iMac and the next day, I couldn't open up any of my system files.
I'm stumped
if anyone has any advice on how to fix? or to advise,  I would be greatly appreciative
If I can avoid doing a clean install, would be helpful as I can't even get to back up at the moment. and to be honest... Lazy me hasn't backed up in 4 months.
Thanks for your time and your help.
Best
Katrina.

Hi,
I actually googled a bit and found the best option was to do a restore of the operating system.
It sounds very daunting. But it was quite easy,
the steps I used.
Reboot your Mac
Hold the Command-R keys down when you hear the boot chimes
you'll see an apple logo come up. then then recovery options. - I chose to reinstall Yosemite through my internet. from memory I had to sign into iCloud (at this point there are limited options on the screen) I also had to click on the internet wifi symbol up the top right and log back into my wireless (as this is operating out of your IOS and isn't configured.
then you just go through the steps. and it begins download. at this point you just need it to do it's thing. you cannot access your mac at this point. which caused me a bit of worry as i didn't want to have to restore or build my mac up again. when it had finished. My mac restarted as it normally would and everything was as it should be and so far.. it's been fine.
hope this helps.
Katrina. 

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