Help with my Windows?

I have Windows 7. About two weeks ago i saved someone's Word document onto my laptop and the document was saved as a .lnk file from his flash disk. So after saving it, I did what i needed to do and printed everything out. But the next day, when i wanted to use my laptop, i was shocked to find that every single programme, document, application EVERYTHING was saved in .lnk word document format. For example, My Itunes is a word document!! Please help!! How do i restore everything??