CDR files will not open in PHOTO-PAINT X5 - says file format is invalid

I have Corel Draw Hone & Student Version X5 and yesterday my PHOTO-PAINT stopped opening my CDR files and i don't know why?

I have searched the internet for answers but to no avail 

ive had the programme for 2 years and never had a problem.

I have a Windows 7 version 

I AM STUCK AND ABOUT TO GIVE UP AND THROW IT AGAINST THE WALL, PLEASE DOES ANYONE HAVE ANY ANSWERS.

All my files match up to the programmes and I've tried very near tip on the web,  I JUST WANT TO OPEN THE FILE FROM COREL DRAW IN PHOTO-PAINT LIKE IT USED TO!