Several viruses at once

My computer is useless at the moment. In the last two days, it´s been infected by, at least, four viruses (ICPP.com/AP Manager, explorer.exe, nrktcvy.exe, newupdate1142C.exe).

I got rid of the ICPP one but the rest are still there. What happens is once I enter my password, I´m taken to my desktop. After about ninety seconds, the screen freezes and a prompt appears saying "Windows Explorer is not responding" with options of restarting the program or searching online for a solution. Then further prompts appear saying "nrktcvy.exe is not responding" and newupdate1142C.exe is not responding" also appear.

Once these pop-ups appear, my desktop stops working. I can see it and the icons but clicking on them doesn´t do anything. The icons don´t even light up. Pressing the Start menu doesn´t work either and if I hover the cursor over the toolbar at the bottom, it doesn´t work. Task Manager won´t launch either.

Ocassionally, if I click on the Mozilla Firefox icon before the Windows Explorer prompt comes up, I can get very bad internet access which takes forever and eventually leads to my computer crashing altogether.

I´ve installed several anti-virtus software but none of them seem to combat the viruses. I´ve also tried launching the computer in safe mode but the viruses also pop up there.

I haven´t the faintest idea what to do here. Anybody have any ideas? Any help is appreciated.

I´d take it to a computer repair place but I´m in Spain at the moment and even if the people there spoke English, I think the technical English would be too much for them.