.php suexec error

Hello, i have a site running about 1 year and this week i had a problem with it.

If i go to my site it’s doe’s not open, only brings a download with type:
application/x-suexec-error (0 B)

I have tried delete all files and uploaded only simple index.php – same error.

I didn’t change any sestings on my webhosting, maybe anybody knows how to solve this problem?

Thanks