First off all you deep breath you dont lose anything and you can solve your problem easly if you experienced user its take nearly 5 minute to get everything like before.
first you need activate task manager
download and double click
http://windowsxp.mvps.org/reg/EnableTM.reg
or clikc windows +r and type regedit strg+f search for DisableTaskMgr change value to zero 0
if you able to show TASKMANAGER find ram resource and kill application

