I am trying to open built-in calculator in Windows 7 Ultimate but it never show up properly. I checked the Task Manager and I found out that it was running. Then, I switched to it by Alt-tab but nothing happened and the calculator program was nowhere to be seen. Looking forward to your answers ! Thanks in advance.

Hi, try this: Win+R - calc - enter If you run calculator, it is in taskbar or not? If you open Task manager, have you seen this? Try Switch to command...

Hi, Thanks for your answer and time. Actually, it was my mistake. I connected my TV as a secondary monitor a few days back and the calculator program was opening on it. I only knew it when I opened the TV a while ago. Out of all the programs, I don't know why this one is showing up there. Usually, I have to drag the programs to secondary monitor. Anyway, appreciate for your effort !