copy.exe

When I open my 6 disk drives C,D,f,h,g & h The error is Windows cannot find ‘copy.exe’. I can not open the drives normally by double clicking I need to open by right click and by selecting explore, I tried to install some anti-virus scanned my drives, I removed some trojan virous which I think are the one who causes the error but when I finished the scan and tried to open my drives the errors is still the same