If you are having problems with your installation then a log file can be helpful in diagnosing the problem. The installer does not create a log unless you enable installer logging in Windows. If you follow these instructions to enable installer logging then the next time you run the installation a log file will be generated.
Please remember to disable logging once you have diagnosed what the problem is. It is not recomeneded that you leave it enabled as it will use up space on your hard drive everytime an installation occurs.
WARNING: Before editting the registry, please ensure that you make a backup!