Network Explorer Crashes

Almost client have a problem when they install a tactician 5.0 on a computer with windows XP.
I sent them the iso we can find on internet and a DVD. They the same problem in the two case.
The installation is OK but when they launch the network explorer they have two error message we can see below.
The first message :
"Warning: A StringBuilder buffer has been overflowed by unmanaged code. The process may become unstable. Insufficient capacity allocated to the StringBuilder before marshaling it."
The second message:
"An unexpected error has occured scanning the network. The application must close."
Who many people see this message?
I tell my customer to ensure they ghave installed Framework. They have installed Microsoft .NET Framework 1.1 and 2.0 SP2 and 3.0 SP1. The problem persist.
Who many people have an idea?
Thank you for your help.
1 person has
this problem