You did a complete reinstall?
You followed the installation instructions to a tee?
Reason I ask is the only way anyone gets a white screen is as I stated from one of two things.
1. Not uploading the templates hense there is nothing for the program to print hense your source code of the page or permissions wrong on them
2. Corrupt or Altered files that cause a parse error. Have you tried downloading a fresh zip to ensure your files are okay
If you continue to have an issue trying to install the program all I can suggest at this point is to purchase an installation