Installing on a server with Php 5.2.17 instead of 5.3.17

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Hi All,

i am moving a concrete site to a new server and i followed the instructions "moving a site"

Everything worked fine until:
I changed the permissions on the files:
files/
packages/
updates/
config/
sitemap.xml
to read/write/execute for owner/group world

Before changing permissions, i actually checked the site and it was available ( with errors) but after changing permissions it is not reachable at all.

I tried it it several times, and checked the server configuration. The only thing that changed is the PHP version from Php 5.3.17 to 5.2.17. Could that be the problem?

Thanks!
Jurre