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#11
You could try doing that and see if it works.
Extract Files from Windows 7 Installation DVD
You may come across lock and permission issues. It's very particular about how you add or modify files into the system32 folder so make sure you follow the directions closely.
Was this issue occurring before you started downloading and installing different themes? What spurred your instruction to run SFC on your computer? What issues were you having and did they coincide with any other changes on your system?