1.5 to 1.5.1.2 upgrade timeout error

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Apologies if you have read this but i thought this question was better suited in this forum
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Hello there,
I am trying to upgrade my 1.5 installation to the above version. I have read the very lengthy and informative guide by podz but i cant see this error mentioned.

i have followed the guide step by step but after i click the upgrade button, i get this error:

Fatal error: Maximum execution time of 30 seconds exceeded in C:\Inetpub\wwwroot\wordpress\wp-admin\upgrade-functions.php on line 316

I have remove BaStats and also markdown(i read that it may cause problems), but this has not helped.

Appreciate some advise.
Thanks in advance
Ali
windows 2003 IIS6 php4