Hi Sudhakar,
I've just grabbed hold of another clean PC with a fresh install of winxp and did another round of thorough testing.
1) Download this zip file:
php-gtk2_with-gtkhtml.zip
Note that this is a zip file containing PHP-GTK v2.0.0 with all the required files to run GtkHTML.
2) Unzip the file. You will see a folder php-gtk2 in there. All the files required are in there, including a sample code for GtkHTML.
3) Open a command window and cd to that folder.
4) Type:
.\gconfd-2.exe|.\php gtkhtml_sample1.php
The .\ is there to make sure that it runs the gconfd-2.exe and php in that directory.
I've tested the above on a fresh install of winxp. So it should run on your machine.
If it does not, then I think it must be because it has loaded other dll's located in your other directories which is "incompatible" with this version of php-gtk2. (Remember you told me you have tried many many other dll's before. You could take a look at your PATH environment variable. Those dll's might be located in your windows directory too.]
I would suggest if you could grab hold of a "clean" PC, try the above zip file. It should work.
Regards,
/kksou