While working on a task to upgrade the hard drives on a Windows 2002 SBS machine. I installed Acronis in order to create an image of the C & D drive then recover it to the new larger hard drive. I recovered the image to the new drives and finished getting everything back online.
I decided to uninstall Acronis which showed to uninstall just fine using it’s uninstall. After backup ran that night it had Volume Shadow Copy errors. I checked and found that the Microsoft VSS writers where not accessible. I ran “VSSadmin / list writers” which showed there was no writers available. After researching I found that others who uninstalled Acronis 9.1 had the same issue. I could not find a solution that worked for anyone. I found an article (linked to below) that has a list of DLL’s that Micrisoft Premier Support recommends to reregister. I reregistered the DLL's and after a reboot there were still no VSS writers available. [more]
I then decided to run System File Checker which is built into Windows XP and Server 2003. I used “sfc.exe /scannow” and let it run. After which I reregistered the DLL’s like before. This time when I ran “VSSadmin /list writers” all the writers were listed. I went back to Backup Exec and was able to select “Shadow?Copy?Components” and “System State”, which I could not before.