IFIX5.0 reinstallation -getting error

can any one help me out??
I am setting up IFIX(5.0) scada on a computer after re-installation of OS(Windows XP).
I have the old back up files(the project folder with all its sub folders and files in it).
I am using Industrial gateway server 7.5
After opening the IFIX, When I select the SCU file and opens the workspace I am getting the error as "cannot find dsterror.dll" and when i try to open the system configuration I am getting the error as "error opening SCUERROR.dll"
Can sombody say whats is the reason behind it.
I can select a new SCU file but still it is getting same error(i think it is not changing)

Open up SCU and look at the file location pointer and change them if necessary.

Thanks for the reply,
I was unable to enter into the scu file. I have tried renaming the scu file, Then it allowed me to open another SCU file. It was a new information to me that each SCU file is configured with a particular location only. Now I placed the project in the configured location.
IT works well.