Most probably (?) a Trojan.
Link Removed
http://www.file.net/process/server.exe.html
The safest way to proceed is to scan your computer thoroughly, with the antivirus you have, plus Malwarebytes,
http://www.malwarebytes.org/
You can also search for the file server.exe manually in Windows, and delete it - in these cases I usually first zip it, and then delete the main file; that way I still have it in the zip... in case something went wrong.
No harm in checking if you have some new mysterious installed programs, either with Windows or, say, Revo Uninstaller,
http://www.revouninstaller.com/revo_uninstaller_free_download.html
I just noticed yesterday I had 4 weird programs, causing ads to pop up with links I...