Hello all,I own a legal version of the b737ngx. I did not use it that much because i have opencockpits hardware (EFIS MCP) which was not compatible until i came across some installation files found in the avsim library. I installed them and did a couple of short test flights (eheh eddt). Really loved it.I also own a CDU from vrinsight and this has also the ability to hook up to the b737ngx. And here i guess is where my trouble began.Somewhere in the proces i think i did something wrong and it leaves me with some strange things happening.when i start a new flight it begins it's sequence of selftests and then when the last test is done, a sort of crash sound is heard and then after about ten seconds an alarm siren sound begins to play.I did a uninstall of the software and a new install with no result. I did a system recovery to an earlier point in time and this has also has no result.I noticed that when i do a new install i'm not asked anymore for my activation code.Does anyone has a clue, without doing a complete new install of win7-x64 and fsx, how i will get my n737ngx running or better flying again?RegardsRené

Once you install the NGX the first time your not going to be asked for the activation code again.