How you are trying to re-register the dll. I am going to give you a small script that would help you more in troubleshooting the problem. I am going to list you some commands for cmd which will help you to re-register the dll. Check the below commands. You will need to type exactly the same.
Code:
cd /d %windir%\system32
Net stop vss
Net stop swprv
regsvr32 ole32.dll
regsvr32 oleaut32.dll
regsvr32 vss_ps.dll
vssvc /register
regsvr32 /i swprv.dll
regsvr32 /i eventcls.dll
regsvr32 es.dll
regsvr32 stdprov.dll
regsvr32 vssui.dll
regsvr32 msxml.dll
regsvr32 msxml3.dll
regsvr32 msxml4.dll
Once you are done with the above work then type dcomnfg in run box and try to modify the configu settings for Volume Shadow copy service.
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