The important file is the ATIMCENC.dll in the system32 folder ('regsvr32 atimcenc.dll' if you manualy copy this file)
You will need to search and find this file from witihn your directories where the attempted instal of the ENCODER packages extracted their files and runtime exe. Normaly C:\ATI\SUPPORT
Copy ATIMCENC.dll to the system32 folder and 'regsvr32 atimcenc.dll' from the start/run (remove quotes)
Connecting <ATI T200 AVStream Analog Capture>:4 with <ATI Media Center Audio Encoder>:0
2007-04-04 17:37:04.203125 [Info.][Config Main]: SinkGraphEx: Found sourcePin: <4> <System.__ComObject>
You need to specify the pin 3 is used and not pin 4 for your cards drivers, change in the XML file