All my icons changed into internet explorer with .lnk Extension

Instructions

To fix the association for a particular file type:
1. Download the registry file(link given below
2. Unzip the file and extract the .REG file to Desktop.
3. Right-click the REG file and choose Merge. Alternately, you can open the Registry Editor and then using the Import option from the File menu, to merge the REG file contents.
Note that you need to be an administrator to apply these fixes.

Download (For Window 7)
Download(For Window Vista)