CAN ANYONE HELP ME PLEASE

Hi, i recently discovered that i was loosing GB on my computer, i dont even download anything everyday i looked i lost over 50 GB i had 400GB / 457 GB left... (C Driver)
today i checked and it was 0 GB left please could anyone help me i really need help i think i got a virus or something :(

please im doing virus scans but no virus detected please help

click on the start button of your windows
then in the command box type CMD and enter

then when you get the command prompt window type"format c: /C /X /P:2"

that should fix all your space loss problems.