Every time I boot my computer I get first this error message: "logonui.exe - Application Error: The instruction at '0x0037149c' referenced memory at '0x0113a170'. The memory cold not be 'read'.". The error dialog box gives me the options 'OK' to terminate and 'Cancel to debug'. But by selecting either one system keeps bringing up similar errors. After selecting OK a few times, I get the logon screen, but am unable to enter enytthing there. Cntrl- Alt-Del also does not work. This is happen even in the Safe Mode, Safe Mode with Networking and Boot using Last Good Configuration. When I try Safe Mode with command prompt, they system tries to boot, but then reboots again.