php on xp

I want to install php on my computer You will say: Oh, that's great. But, ther is a problem... :-( I don't know what, so I will write the steps I follow: Tell me if something is wrong... PS: My computer: Win XP, C: on FAT32, and D,E,F,G,...- NTFS PHP install 1) Unzip to c:\php\ 2) Copy php4ts.dll, and c:\php\dlls\*.dll, in c:\windows\system32 3) copy php.ini-dis -> c:\windows\php.ini 4) edit php.ini extension_dir = "C:\php\extensions" doc_root = "c:\webroot" IIS 5.1 config 1) Administrative tools -> Internet Information Services 2) Right-Click on "Web Sites" => Properties 3) Home Directory -> Configuration -> Application Mappings -> Add 4) In "Add/Edit Application Extension Mapping" executable: C:\php\php.exe %s %s' extension: php verbs: All verbs Script Engine: chk BUT OK BUTTON IS INACTIVE ... If somebody can help me.. Merci mult (Thank's a lot)