"Richard Jackson" wrote:
I don't know about 2000, but under XP you can have as many versions of .NET installed as you want. Go to: C:\Documents and Settings\(username)\Local Settings\Application Data\Mathsoft\Mathcad and delete the folder "12". It will be recreated next time you start Mathcad. That might fix it. Also, if you are running 12.0 you should download the service release from the PTC site. Richard