First, thank you for taking the time to help those of us who rely on computers every day but have no clue how they work or what to do when things go bad. I am starting a new thread as directed, but I am having the same issue as several others. This past Sunday I found out that my MSE was off and when I went through the step of uninstalling and reinstalling I started getting the "Critical Error...shutdown in one minute" message shortly (less than a minute) after rebooting. I have tried to uninstall MSE, but cannot get it done before the computer reboots. The initial scan, before it hit the critical error, was showing mulitple SIREFEF infections. Acer Aspire Desktop AMD processor Windows Home Ultimate 64 Thanks!