I installed it on winXP and while running it, I was asked to update "something", dont remember exactly what it was.

After this update, BTC trader didnt start again!
I uninstalled and reinstalled it, restart winXP, but BTC trader dont start. I only see for short time the "start window".
What can I do? Thanks.
First, you can try to wipe all cached data which are usually stored at "C:\Users\\AppData\Roaming\.btctrader\dev".
And file me IDE log please if something goes wrong after wiping cache.