UltraMon encountered a fatal error and will exit.After searching trough forums I have come across this post which describes a simple registry edit to fix this problem.
Version: 3.0.3 OS: 6.1.6801 x64
Source file: .\ButtonRendererVistaComposited.cpp
Return value: 0
Last error: 1814
You should always back up your registry before editing
First click Start and then click on Run and type "regedit"
Navigate to [HKEY_CURRENT_USER\Software\Realtime Soft\UltraMon\3.0.4\Window Buttons]
Now set "Move Window Button" and "Maximize to Desktop Button" to 0 by double clicking on them and chaning it to 0.
That should do the trick and allow you to run UltraMon on Windows 7. I'm using build 7100 myself and it worked for me and I hope it works for you as well.
All credit goes to the guys at Realtime Soft Forum.