Just in case someone else will be the same problem, i have fixed it installing .NET 3.5 which has installed also 3.0.
So now i have the following version on my PC:
2.0 SP1
3.0 SP1
3.5
4 Client Profile

the original problem was fixed and all seems to be ok.
Bye!

First of all many thanks for your beautifull job!!!

And then please help me...
I've installed yesterday PlanG 2.0.3.486 for the first time (no previous version on the PC), but every time i load a FlightPlan and then try to use the print functions (both "preview" and "quick" print) i get the same Windows error: "...The application will now close" (indeed i have an italian version of Windows).

The details of the error are:
EventType : clr20r3     P1 : plang.exe     P2 : 2.0.3.486     P3 : 4d347521
P4 : windowsbase     P5 : 4.0.0.0     P6 : 4ba1f805     P7 : 3a     P8 : 1b
P9 : fatalerror 

I have Windows XP Pro 32 Service Pack 3 on a DELL Precision 4400, and 3 printers installed (an "HP deskjet", "Office document writer" and "do PDF V7") perfectly working with the other programs.
During installation of PlanG i had no errors of any kind and the installer installed ".NET framework 4 Client Profile" on the previous ".NET Framework 2.0 Service Pack 1" (as I can see on the list of the installed applications).

Any suggestion?
Thanks in advance!