Login seems to work but doesn;t

I have just installed gallery1.5.2-RC1 .
on one computer it works fine, but on the laptop, the login page seems satisfied ,,,,, but then doesn;t bring up the logged in page.

Checking the FAQ, I disabled the firewall and that had no effect.
Other galleries login properly on the laptop.

With it working properly on the other computer it wouls seem to be a hardware problem, but if that were so how come the other galleies login properly?

Blessings,
Gaynor

The following information is required to get an answer:
Get this information from the PHP diagnostic (in the configuration wizard).
Gallery URL (optional but very useful):http://www.travelpicsmcc.com/Gallery1.5.2-RC1/gallery/
Gallery version:1.5.2-RC1
Apache version:1.3.33
PHP version (don't just say PHP 4, please):4.4.1
Graphics Toolkit:image Magick 5.4.7
Operating system:[i]XP Tablet.
Web browser/version (if applicable): IE6