I am struggeling for days to install OAuth module of PHP to apache, but it simply doesn\'t want to work. I have tried many combinations, but I just can\'t get it to work:
I think the problem that you're running into is that your OAuth DLL's are 32bit (x86) whereas your OS is x64. I'm dealing with a similar problem, looking for the OAuth DLL that is both x64 and for PHP 5.4.
I did however find a x64 DLL that works for PHP 5.3. It's available here: http://www.mediafire.com/php-win64-extensions. Just make sure to get the file named php_oauth-1.2.2-5.3-VC9-x64.zip as the other OAuth DLL is not thread safe (nts).
If you are fine using PHP 5.3 then that DLL should work for you.