backup job fails - Error E4F3000E

We get the error message: snapshot failure while using volume shadow copy service . please check application event log for VSS errors. error code: endcreate snapshot set (-2147212303) . except this error message the software claims that D: drive has no backup points, which is wrong.,

We tried to google it, but the problem persists. I don't think there is a problem of fragmantation, since the computer shows 0% fragmantation for all drives. I don't think it's a problem of not enough disk space for the system reserved partition either, since the computer shows 70% free out of the 100M.

Does anyone has an idea ?

Thank you