The problem may be that regsvr32.exe may not be executed without admin privelages on your system.
so I would right click on register_ocx.bat and RUN as Administrator
I run vista as well, and this might be the issue
modify your file so that the /s are all removed so you can see the results..
Code:
regsvr32 a.ocx
regsvr32 DXAnimatedGIF.ocx
regsvr32 imagelist.ocx
regsvr32 MSCOMCTL.OCX
After running the bat file, you will get a sucess or fail. please report your findings
GeorgeS