How to upgrade PHP? Various tangle

How to upgrade PHP ???? Various kinds of tangle ah I am this is a key book (1.3.29 + 4.3.4 Micron Sky that), now must upgrade to 5.2.8, did not play PHP a mess, always error (Unknown (): unabletoloaddynamiclibrary .... xxx. dll does not find the specified module) how to upgrade PHP ???? Various confusions
I am a 1 key book (1.3.29 + 4.3.4 Micron Sky). now I have to upgrade it to 5.2.8. I have never played any PHP script. I always report an error (Unknown (): unable to load dynamic library .... xxx. dll does not find the specified module.) N methods are also found online, which is invalid. QQ expert advice...

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Uninstall all and install them directly
Http://www.apachefriends.org/zh_cn/xampp-windows.html

You can upgrade it later.
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Dll file missing
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If you do not understand PHP, install the integration package.
XAMPP
PHPNOW
Yes.
No module is configured in php. ini. sometimes you need to copy this file to system32.
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The integration environment is good for beginners.