Would I would do is pres CTRL ALT DEL to open task manager>proccess>explorer.exe>end Task.

Then up the top:
click new task
enter explorer.exe

and your computer should unfreeze. then try uninstalling netlimiter.

If it still doesnt work, go into administrator account or safemode to uninstall it.

I would enable System restore. (unless your backing up your harddrive elsewhere