Joomla! Template AGROnomy PT - Item Support

Hello Sir,
I am using your Agronomy template for multilingual joomla 2.5 site and I have some problems regarding to this template are as follows:

1) Login & Register buttons are shown in preview but not display it on template, instead of that search textbox is present in top panel, when I add any php code for Login button, the template is not supporting that code and it affect the whole structure of the template.

2) When I click on any photo gallery image, then it not displaying any full size image into the lightbox. when all lightbox code is present into the index.php file.
Another issue is that, when I try to install the extension to create a module in joomla for "artsexylightbox",on the same time it gives error message => JInstaller: :Install: Cannot find XML setup file.

3)I installed the 'NivoSzakiSlider' but the format of that slider is having some different visualization reference to the previous & next button images and small round buttons series which present at the bottom of the slider, I linked it properly by the media manager-> images section but it couldn't get work same like that original template.

Please provide me solution regarding these queries

Thank You,
Regards ,

With the reference to above comment POSTED on 2012-12-07 from me, i am waiting for your reply. I am trying to solve these problems but it cant work on these issue.
Please reply me as early as possible with the solution regarding the above queries.

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