laoda99 SG on win xp pc. it says “C:\WINDOWS\SYSTEM32\AUTOEXEC.NT. The system file is not suitable for running MS-DOS and Microsoft Windows applications. Choose ‘Close’ to terminate the application.
ndmmxiaomayi SG I presume that this is on a laptop? Can you please post the brand name and model number?
ndmmxiaomayi SG I don't believe it's coincidental that both XP machines have a corrupted file. Can you please try uninstalling and reinstalling Mathcad? If nothing works, this Microsoft article will help you: http://support.microsoft.com/kb/324767