When I tried to run SSD Optimizer it failed with error: No Optimization due to "Volume Shadow Copy Service data". Tried fixes suggested in this forum but they did not help. So, did a repair install of Windows XP and was able to do Optimization. After applying all Windows Updates same problem returned. CMD "vssadmin list shadows" was returning 0x8000ffff. Internet search lead to fact that 0x8000ffff could be caused by service "Microsoft Software Shadow Copy Provider" not started. Search for "Microsoft Software Shadow Copy Provider" lead me to http://social.technet.microsoft.com/Forums/en/winservergen/thread/413d4cbe-feb1-4a29-b07f-28e4c80ee814 , there a post by Chang Yin suggested: "following commands one-by-one to manually register these DLL files (most of similar problems can be resolved after this):
net stop vss
net stop swprv
regsvr32 /i swprv.dll
regsvr32 /i eventcls.dll
Then, try reboot the server to see how it goes."
After following his instructions was able to run CMD "vssadmin list shadows" and could do Optimizations.