Right then, I've got an old laptop running Vista (stop sniggering!!). I was running the qb64_2021-01-16-02-31-31_6af5bca_win-x86 dev version without problem on here. The laptop had been getting a GUI error on boot up and the recommended fix was to install net framework 3.5. I did this and all seemed fine with the world, the laptop booted without error. I then decided to download the latest QB dev build which I did and installed it. Now when I run QB64 it nothing happens. It shows up as a running process in task manager (QB64 Compiler using 136K memory) but nothing appears on screen. I thought it may be an incompatability with Vista so re-installed the previous dev build. Still nothing. Okay, what have I screwed up? Is it a problem with net framework 3.5?
BTW, everything is whitelisted in Avast anti virus