Hi, This used to work fine, until today. I'm running XP SP3 with a 1TB disk and a 250GB disk, each with 2 partions. Today I started HDMP to do some backups and whatever option I choose from the slash screen begins to open then stops with an: "Operation failed" "Bad parameter of function" message ticking more options gives me Error source: Hard Disk Manager Error code: 0x1100a Searching the knowledge base (yes BEFORE posting applause please) correctly suggested that Volume Shadow Copy might not be started, so I have set that to auto and started it and it is showing "started" "MS software Shadow Copy Provider" was also stopped so I have started that and set it to auto. I have tried un-installing and re-installing the program but get the same result. Virus checks are clean and other progs are running normally. Any ideas please?