|re: it doesnt show anything|
What does that mean?
Office 2003 requires that the Compatibility Pack be installed in order to open Office 2007 (docx, xlsx, etc.) files.
If you have installed the Compatibility Pack, please tell us exactly what happens when you try to open your files.
If your old files (doc, xls, etc.) are not opening, make sure that these documents are still associated with the 2003 version of Office.
In any folder, pull down Tools...Folder Options...File Types tab.
Scroll down to each file type, e.g. DOC and make sure it is set up to open with Microsoft Office Word, XLS with Excel, etc.
Your files may have lost their file associations when you swapped the different versions of Office.