can i delete setup log files in disk cleanup
You can use Windows Disk Cleanup to delete them but I recommend Mil Shield here because Windows Registry contains these setup log values and this program will clean them all automatically and fully from your PC.
In the remaining 25% of cases, the setup log files are most often used to uninstall the application. Deleting log files will definitely clear up hard disk space (these 1,5 GB are an enormous waste of hard disk space, man!).