Driver version 12.4 was the last version to support everything.
After 12.4, anything under the 5000 series is no longer supported in the new catalyst drivers, and AMD has a separate set of "legacy" drivers to use.
AMD Catalyst™ Driver for AMD Radeon™ HD 4000, HD 3000 and HD 2000 Series
http://support.amd.com/us/gpudownload/windows/legacy/Pages/legacy-radeonaiw-vista64.aspx Unfortunately it is quite common for the legacy drivers and mainstream drivers to break each other if both are installed.
Very questionable in my opinion as their current motherboard chip sets have 4000 series IGP. AMD claims they did this to shrink the size of the main catalyst driver download.