Windows and Old PHP Versions

I have a Windows dedicated server client with PHP 4.0.X have upgraded for him to 4.3.10, but some of his scripts cant work as a result. Actually only one domain out of all the domains hosted there having an issue. He wanted to revert back to the PHP 4.0.X version because of this.

I can do this for him. But I am worried about the implications of this. Whats the risk of running PHP 4.0.X in Windows? Is it worth the risk?
Already warn him that if his machine is hacked, I can only help him reload the OS.......

 

 

 

 

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