If the task bar is not visible at all, you will need to press Ctrl+Alt+Del key to bring up the taskbar. Go to "New Task" from the menu bar and enter "explorer.exe". You will need to do this several times if your task bar disappears again. Go to "C:\WINDOWS" folder through "My Computer". If accessing the My Computer folder is not possible then you can go to Command prompt by typing "cmd" in the "Run" command line and accessing the "WINDOWS" folder from here.

Copy the EXPLORER.EXE (Computer icon) file and paste it in the same folder. A file "Copy of EXPLORER.EXE" will be created in the folder. Now change the file name to your TBS.exe.