Still Trying To Solve The Problem

This is my Black Dell computer, which does not get that much use, as I prefer a Mac to a Windows machine. Nevertheless, some times I need to run software that can only work on Windows, it is then that it justifies its existence. I have tried running dual and even triple operating systems on the Mac, with a fair bit of success, but have always returned to two separate computers. This computer worked very well, until I accidentally downloaded some malicious software. I thought OK, just remove it, no success. I then thought OK, just restore it to a previous state, the malicious software remained. Finally I wiped the drive clean and restored it from an early backup, but I am now trying to get it back to its state directly before the problem. This will eventually happen, but seems to be taking forever.