HELP! Everything tries to open with Wordperfect. Virus?

Hi, I am writing on someone else's behalf. Whenever she tries to open a program, she gets a warning saying that program cannot be opened with Wordperfect, suggesting that all the windows she opens are trying to use Wordperfect instead of the appropriate application. This includes system restore. Has anyone heard of this? If so, what can she do about it? She really can't do much investigating because the same error occurs every time she tries to open anything. Please help!

 

I will repost this in security. Thanks!