Checkout Step 3 Hangs!

I've just uploaded my site to a live server (while I test my payment gateway), however I have a problem!

Here's a list of what happens...

1 - Customer presses 'confirm' button on step 3 of the checkout.
2 - Web-browser tries to load new page, but fails (timeout).
3 - Web server (apache) crashes.
3 - No order email is sent to the customer.
4 - Order is successfully completed with payment gateway!
5 - Order appears in admin, all data present and correct! :S

And my specs...

Apache/2.2.3 (Win32) DAV/2 mod_ssl/2.2.3 OpenSSL/0.9.8d mod_autoindex_color PHP/5.1.6

MySQL 5.0.24a-community-nt

libcurl/7.14.0 OpenSSL/0.9.8d zlib/1.2.3

Protx Payment Gateway

Apache Error Log

FATAL: erealloc(): Unable to allocate 98304 bytes
'uname' is not recognized as an internal or external command,
operable program or batch file.
'uptime' is not recognized as an internal or external command,
operable program or batch file.

Any help would be great as I'm totally stuck!! Thanks. :)

Ok, I've sorted this problem now.

It was the Hide SID (dwno's mod) that was causing an issue. After I uninstalled it everything worked fine! :)

Thanks for the follow up on the problem.

No problem. After a few hours of work, lots of server tweaking and even a server reinstall I figured it would be nice to share my solution with the community.

Hopefully it'll help other out.