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I have windows vista, Delphi 2007 and MyDac 5.10 when I try to compile a program I get the following error:

[DCC Error] MyConnectForm.pas(257): F2039 Could not create output file 'C:\Program Files\CoreLab\MyDac for Delphi 2007\Lib\MyConnectForm.dcu'

What could be the problem?

It seems that this folder is read-only.
Try to uncheck the Read-only property in the folder properties window.

You can also specify unit output directory to another folder.
Use the "Project->Options->Directories/Conditionals->Unit output directory" editor for this.