Ah! Important question:
Which Port did the console give you out, when you start your CS2D? When the "initialized using port" is zero, your cs2d isn't able to open a port for a connection (the game is blocked by Firewall or other applications).
And open the usgn.dat file (located in sys) with a texteditor. These two lines have to be at the top of the file:
1
2
2
85.214.102.60|usgn.de 36963
Otherwise your usgn.dat file has been modified.
Try also to run cs2d as administrator. Maybe your rights of some files are wrong (read/execute rights).
You can modify the rights of the usgn.dat file with rightclick on usgn.dat -> properties -> Security -> select %your_user_name% -> (bottom box) enable full access and read/execute -> click OK -> start your CS2D. ( I hope it's right, because my OS isn't english).
Klin