Really have so old and slow pc, which doesn't run properly v2.6, you are writing now on machine with win7, it should be enough. Perhaps you have some software problems (operating system, drivers, directx, viruses etc). Show us your hardware specs if you can, then we will see is it your computer fast enough.
PS.Better turn off your antivir software during AmigaEXE gaming, it shows false alarms and delete game. All EXEs from this site
are surely 100% virus free and full reliable.