That don't sound good. Yes sir it did come with Mcaffee trial. I thought I got rid of it but it don't look like it. Whats the explorer.exe mean it comes up and I close it. It restarts the screen.
explorer.exe is yours windows UI, taskbar and such, it is programmed to reboot when killed
EDIT: Btw, mcaffee is like the clap, its REALLY hard to get rid of lol
lol