Start with the following, boot the system, start tapping F8, when the menu
appears, select "Last Known Good Configuration" and press enter.
If that fails, repeat the above but select Safe Mode and press enter.
At Safe Mode, select the user account named "Administrator," leave the
password blank and press enter. If you have an antivirus application, I
would update it from there and run a scan. If the system is clear, try
using System Restore to take your system back to a time prior to when this
began. Start\All Programs\Accessories\System Tools\System Restore.
***NOTE: run the virus scan before attempting System Restore because if you
have a virus the restore files may be infected as well.
If the above fails to resolve it, if you have the application PC Anywhere
installed on your system, see the following Knowledge Base Article and
perform the steps it outlines from Safe Mode: http://support.microsoft.com/default.aspx?...331880&Produc