Vista ultimate's back-up function does not work

The back-up function does not work anymore since I replaced my Asrock NF5 mobo by a MSI K9N2SLI-platinum.
If I start backing up either files or full system it looks for back-up devices, actually finds a suitable partition, but then a window pops up telling: Microsoft Windows Buck-up does not work any more. A problem did occur which caused failure of the program (free translated from Dutch). The program is being closed and you will be informed when a solution is available.
Two other computers in my private network back-up just fine. One of these is equipped with the same motherboard. It is very strange. Repeated reinstall of vista did not cure the problem.
Anybody having an idea?

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