Creo 3 installation error

[ptc-3842167]

I've installed successfully on my laptop, but I'm having trouble on my desktop. I enter the product code from the install instruction, enter my username and password and get the error shown below. (Note that I blanked out the product code from the installation instructions pdf.)

[sm]

Could be a dumb question, but is your laptop connected to the internet when entering your credentials? You need to connect to www.ptc.com to validate the license.

[ptc-3842167]

Both computers are connected to the internet. Installation went fine on the laptop.

[sm]

Okay, I will ask Mark to contact you to see if he can help diagnose the problem. It should be the same for both machines.

[ptc-6809928]

I have exactly the same problem but this appears when trying to install on teh licence server. I have checked and there is Internet connectivity and will connect to www.ptc.com quite happily.