To edit the Default Access Permissions using Dcomcnfg.exe
On the Windows taskbar, click Start > Run.
In the Open box, type the following text:
dcomcnfg.exe
Click OK.
Do one of the following:
In Windows 2003/XP, expand Component Services, and then expand Computers. Right-click My Computer, and then click Properties. On the Default COM Security tab, under Access Permissions, Edit Default.
In all other versions of Windows, on the Default Security tab, under Default Access Permissions, click Edit Default.
The Access Permission pane is normally blank. If the window is not blank, make sure that the Administrators, Interactive, and System accounts are set to Allow Access. .