Microsoft Excel Office 2007 converter problems

I loaded Office 2007 and then had to uninstall it and I just loaded Office 2003.  I had some problems where I had to eliminate everything out of the Registry for Office 12 and then I also had to rebuild the MAPI files in order to get it working.  I seem to have resolved those issues, but the issue I have now is that when I load the Office Converter 2007 enabling me to view and work with files created in the 2007 version from the 2003 program upon converting I get the following message from Excel:

"Microsoft Office Excel is waiting for another application to complete an OLE action."
Then after I click OK I get: "The converter failed to open the file"

In Word I get:

"There was an error opening the file"
and on the bottom I get a message that states, "Wordconv.exe was closed.  To help protect your computer Data Execution Prevention has closed wordconv.exe."

I disabled the Data Execution Prevention and the Word and Excel files would not open still.  Please advise.  Thanks.