RPC server

When I recently tried to back up my computer using the Acronis True Image Home (version 2010) program, the following statement appeared:
"Failed to create the scheduled task. Error #1722 - The RPC server is unavailable". System info presented below.
Appreciate any help offered.
Bagalot

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM)2 Quad CPU Q8200 @ 2.33GHz, Intel64 Family 6 Model 23 Stepping 10
Processor Count: 4
RAM: 4095 Mb
Graphics Card: ATI Radeon HD 4350, 512 Mb
Hard Drives: C: Total - 478511 MB, Free - 346380 MB;
Motherboard: Dell Inc., 0U880P
Antivirus: Microsoft Security Essentials, Updated and Enabled