It sounds like it's lost the file associations.
Click Here to open a Doug Knox page with links to download a number of file association fixes.
Get the last one on the list first..."ZIP Folder Association Fix"...so you can unzip the others. Read the directions at the top of the page.
Then download the fix for "lnk" which should fix the shortcuts.
If you find other things that don't open, go back to that page, download, unzip and run the appropriate fix.