If You Typed Incorrrectly And the File is "Itibiti.exe"
..then the file is the executable of the Voice Over IP phone software.. If you installed such, then it's supposed to be there.. If you have typed the file name correctly in the text body of your post: "Itibtit.exe"(no "i" at the end of the file name) then please check to make sure it's not malware by downloading, installing, updating, then running a full scan with the free removal tools at the links below:
SUPERAntispyware Removal Tool
And even if the file name is legitimate, because you're experiencing a slow computer, it might be a good idea to install and run the software listed above.
Hope this helps.