Windows GUI won't load on boot?

So… here’s the deal. I run Blackbox on my computer (XP).. I was just working and I get pop ups blah blah. Ran some scans, got rid of some shit, reboot and bam.. no gui. no blackbox. nothing but the wallpaper. I can still run programs from task manager > cmd line (can’t even use the shortcut “Windows key + R), but well… shiit! I also can’t scroll using the touch pad, nor can I control the volume with the function key, etc…..
any idea of what’s going on?