MT4 Infected by virus! Help!

So I have been downloading decompiled EA's from another trading robot forum (which shall remain nameless) and it looks like karma has come back to bite me as I seem to have a virus on my computer. I tried bitdefender and Kapersky but they have not seemed to get rid of it. My MT4 keeps crashing and freezing up and I cant trade.
Has anyone had a similar problem? What can I do?

sounds more like an indicator or script etc that is automatically loading with your charts but is caught in some loop calculating the size of god's balls or something. if it is stuck calculating something it will freeze mt4 until it is done. i have had this before with a bug in one of my indicators. i think there is a template or something somewhere you can simply delete to get back to having a blank chart load, therefore not allowing the dodgy code to run and lock your mt4. google mt4 freeze etc

The best way to do this is to just tell MT4 not to open anything when it is launched.

Go to the profiles subdirectory in your installation directory. Find a file called lastprofile.ini. Double click on it and it should open in Notepad. Just delete the text that is there which is the last profile opened. Now save the file and close it.

Now open MT4 as per normal. It should open with no charts actually being opened.

Also just delete those decompiled EAs.