Limewire killed my system...help (can't use Task Manager or open options)

[helpme87]

My wife was downloading a song and it was not filed as corrupt or anything and has been checked by several scans. All of a sudden my computer reset, i am unable to get LimeWire to log off without forcing through a programs to stop. It will not uninstall completely and than won't reinstall calling the program corrupt. I have also lost all of my Notification area (task bar right side) They are empty boxes that i can access. I am unable to CTRL/ALT/DEL also and can not open any option menus in any programs includeing LimeWire. WFT do i do now? any help is appreciated. I have years of billing and work info on this computer and can't afford to lose it. thanks in advance