Look through the actual php code of the modules that were recently uploaded. Pay most attention to any administrative ones. You will need to find a line that says something like
case "superuser":
or
case "everyheader":
or
case "everyfooter":
or
case "everyhit":
or the same lines with
if () instead of
case. What you want to do is to disable the functionality of this code so you can get into the grotto. To do that, change the part within quotes to anything other than what it is now. For instance, if you find "superuser", change it to "xsuperuser". This is going to stop the branch of code from executing and will allow you to enter the grotto once you've hit the right module with this modification. Be sure to undo it in all modules other than the one that's causing trouble. Then uninstall the troublesome one. You are then encouraged to report the problem in the correct thread for the faulting module.