hello people, how are you? FYI i'm using sugar 4.5.1, php 5.4.2, IIS 5.1 and mysql 5

i have a problem when i enter in users module, then see a user detail a when a click on "next" llink (on the pager). I.e. when i want to browse users details something goes wrong and the url formed is the following:
http://localhost/sugarcrm/index.php/sugarcrm/index.php?action=DetailView&module=Users&record=1&stamp=1194 359818020395100&offset=2&InDetailNav=1

if you can see, the url formed by the pager has "sugarcrm/index.php" twice. What could be causing this?

Thanks in advance!