Can't open any word documents

Hi, I downloaded PDFcreator, but now I have the problem that I can’t open any word or PDF document as I’m used to. And my bookkeeping program is locked too, I can’t open it in any way. Nor can I delete PDFcreator. This is a big problem for me, because now I can’t do most of my work on this computer. And I have to get my bookkeeping to my accountant soon.

Please help me!