Gave a user his new laptop yesterday and today he already has a problem

He was using it ok up to lunchtime and was working from home connected to our network via Citrix. He then had an incoming Skype call which crashed his Citrix link - since when he has been unable to reconnect using Citrix.

I've checked his Skype and we have stopped it using ports 80 and 443 however he still cannot connect.

Tried system restore - no joy.
Talked him through ipconfig release and renew - again no joy.
Temporarily turnd off firewall - no joy.
He even uninstalled Skype and that still did not help.

Short of pulling that laptop back in for a closer inspection has anyone got any ideas what to try next?

It is runing Windows 7 Pro.