There is no metamod 2.6 yet. Last known version (at least for me) is 1.17.4. Podbot2.5 couldn't start work with CS1.6 because its code is too old and it's not supporting new weapons of CS1.6 . The first step You need to get to work Your CS without other fun mods (amxmodx and statsme for example). Read this topic - how to install metamod:
http://forums.bots-united.com/showthread.php?t=2576
and download from
www.metamod.org the latest version of metamod and download from filebase the fullpack with R2B46c (currently the latest version of podbot mm - we call it so since it's a metamod version of old PODbot 2.5). Unzip to correct places (look again to the topic about how to install metamod).
Go to Your plugins.ini (addons\metamod directory) and remove all lines started with linux (since You have Win XP You don't need them at all) and comment out (by ";" at beginning of the line - without quotes) the call for amxmodx and statsme. So - Your plugins.ini should look like this:
win32 addons/podbot/podbot_mm.dll
; win32 addons/statsme/dlls/statsme_mm.dll
; win32 addons/amxmodx/dlls/amxmodx_mm.dll
You don't need at all statsme if You are using amxmodx, BTW
Then try to start the server and look if You are able to join it. After making this done - go back we will try to help You with other steps (amxmodx).