Hi,
What is the error you got when trying to run VSS? Please write it down. Also please go to Event Viewer to see if there is any related error occurs. If so, please also copy the error to here.
Here are the steps to register related files. They may be performed once, but please try each command one by one in order to see if there is any error occur on a specific command. Thank you for your time.
1. Click Start, click Run, type cmd, and then click OK.
2. Type the following commands at a command prompt. Press ENTER after you type each command.
3. cd /d %windir%\system32
4. Net stop vss
5. Net stop swprv
6. regsvr32 ole32.dll
7. regsvr32 oleaut32.dll
8. regsvr32 vss_ps.dll
9. vssvc /register
10. regsvr32 /i swprv.dll
11. regsvr32 /i eventcls.dll
12. regsvr32 es.dll
13. regsvr32 stdprov.dll
14. regsvr32 vssui.dll
15. regsvr32 msxml.dll
16. regsvr32 msxml3.dll
17. regsvr32 msxml4.dll