excel file uplodaded in sharepoint 2013 document library not opening

I have a document library in sharepoint where excel files are uploaded. But when we click on the excel file we are not able to view it.

It give me the following error. Microsoft Office Excel cannot access the file. There are several reasons: The file name or path does not exist. The file is being used by another program.

And for some browsers it just asks for username and password and after entering the userid and password,it doesnot get opened.

Am I missing something?Please help.