Hello Kozhaikin,
Programs and drivers must be reinstalled. They cannot just be copied over since they also add many various registry entries when installed that would not get carried over by just copying the files over.
You also do not want to copy over to merge any old system files and folders.
You could copy any personal files (music, documents, etc...) you wanted from within the windows.old.000 folder back to your current installation though.
Hope this helps,

Shawn