There are a number of ways to proceed. See the tutorial below.
A link to an earlier version of Partition Wizard (v4.2) was given early in the discussion thread. If you can't get hold of this there are 2 other ways to procede without destroying your data. ALL approaches come with a risk.
Read this tutorial Convert a Dynamic Disk to a Basic Disk
In addition to suggesting option 4, I gave another another way if you are comfortable using a Hex editor. Takes 30 seconds, but not everyone is comfortable doing this. See post 85: Convert a Dynamic Disk to a Basic Disk
the theog post 2 should help making recovery disks if all else fails. I would suggest you try to make your recovery disks first then try the above approaches. Every approach comes with a risk - back up your data first