Ok.
Maybe I should have been clearer but you probably should have copied rather than moved.
First, download this file
here. You will need to right click on the link and "save target as". Hopefully this will work. It seems to be a fairly standard file.
Then, if you have anti-virus or spyware blocking software run them both to check there is nothing affecting your computer. I think malware (adware/spyware) is the most likely thing to have deleted the file.
Third, Make sure you have a backup of the file.
Fourth, post here so I can take the file off the server!