Damaged or Incomplete

Hi

Getting extremely annoyed with this £2k mac ive only had for a few months... to put it very politely!

I’ve had my user lost 3 times, all my data wiped from an Apple support worker telling me the wrong information... now I have logged in today and I cannot open or use any program what so ever!

Which ever program I click on... ‘you can’t open the application because it may be damaged or incomplete’

Can somebody please give me any help or advise to try and get this working before having to wait all day for an advisor to call and spend another hour or so on the phone!

Thanks in advance