Hi , I work in a school and teachers come and they plug in their usbs and its full of viruses. we have Mcafee Antivirus and it most of the time cleans and protects our PCs from the viruses but this time it didnt. Most of the *.exe extentions dont work when its double clicked sometimes it gives this message when we double click it The NTVDM CPU has encoutered an Illegal instruction. not only that this message pops up whenever we want to run Taskmgr.exe regedit and run > cmd and none of those work only this message pops up and i close it and then nothing happenes. another problem i'm facing is the C: partition when i double click it the " Folders " section/column comes on the left side no matter how many times i press the "Folders" icon to cancel this column and make it disappear from the left side of the screen. I tried scanning the PC full scan with Mcafee , Malewarebytes and SuperAntiVirus and nothing happens im still facing the same problem . Thank you ill attach pictures so you would have some idea of my problem.