Before you go doing any reinstalls, have you checked your settings?
First, load up a project in DB that Sync isn't working in and try running the project under different display settings from within DB's Project Settings.
No joy? Then check your AGP settings.
Close DB.
Right-Click Desktop and select <Properties>
On the properties windows, click on <Settings>
On the Settings tab, click <Advanced> button
On Advanced tab click on the tab that refers to your AGP settings.
I use NVidia so I don't know what other AGP tabs look like. With NVidia though, there are some global settings in the AGP that can be set to application-controlled. You could try setting all those settings to application controlled so Windows lets the application deal with handling graphics.
Alternatively, you can <Add Profile> which gives an application like DBPro it's own unique settings.
Also, check the <Monitor> tab and make sure the screen refresh rate is set to a compatible mode.
Failing that, check WIndows Update and also your AGP manufacturers site for any updated AGP drivers and then try updating them and then uninstalling and reinstalling DB on top of those.
I wouldn't personally recommend a Windows reinstall to fix this, unless other 3D programs or games have also stopped working on your PC and you have tried all of the above. If they run OK then there shouldn't be any need, just some tweaking and reconfiguring should do the trick.
