|The computer is not running in debugging mode, although the application might think that it is. Unless you are a developer and have a suitable debugger installed this wouldn't even be possible. This is a compatibility issue. MathCAD 2001i is not compatible with Windows 7. You could try running the application in compatibility mode, accessible from the programs properties in Windows Explorer. If that doesn't work you have a number of options.|
1. Upgrade to a more recent and compatible version of MathCAD. This would be best.
2. If your edition of Windows 7 supports XP mode you could try that.
3. Install VirtualPC or VirtualBox and install XP on that. You can then install MathCAD in that emulated OS.