Hi Sapphanie,
I'm really sorry that no one has got back to you. I have been away for a while..
The file associations have gone and there are 2 ways we can get it sorted. First of all if something like this just started happening then you could use System Restore to get your PC back to the way it was before it started happening.
Secondly you can try and reassociate the files with their correct programs. On this page...
File association fixes for Windows Vista there are links to file associations fixes. Get the one lnk one...
http://www.winhelponline.com/fileasso/lnkfix_vista.zip and unzip it. Inside there will be a .reg file, double click this and it should fix your Desktop Icons.
To fix your Office Docs in Explorer right click on a Word file and select Open With, you should be able to find say Microsoft Word in a list of programs. There will be an box you can tick to always open Word Files with MS Word.
Hope this helps,
regards
Steve