is it Windows, Mac or Linux? What's your OS version?
Is "ClassicInstallCD-53.71.iso" also located in the FlowetPot/ROMs folder?
Please send me log files to email@example.com To obtain them, please follow the following (simple) procedure:
Run FlowerPot.exe, press Configure button. The WinUAE window will pop up. Click "Configurations" from the left menu, then select "InstalOS4" configuration entry from the right menu and then click "Load" button. Then select "Miscellaneous" from the left menu and enable "Create winuaelog.txt" and "Log illegal memory accesses". Then click the Start button. When it crashes, locate the log files "winuaebootlog.txt" and "winuaelog.txt" in FlowerPot/WinUAE folder.