IVAO - IVAC FSX

For those of you that fly on the IVAO network - have any of you tried to use the new IVAC software to enable FSX to be used for online flying?

I have just downloaded it and went to give it a try, when I open it from the 'Add-Ons' menu, I get the following error message -

(Window title) - Microsoft Visual C++

Run Time Error!

R6025

Pure Virtual Function Call

Has anybody else experianced this?

My system specs are -

Compaq Presario
AMD Athlon 64 Processor
3500+
1.79GHz, 960MB RAM
Nvidia GeForce 6150 LE

Any help would be appreciated