Just tried the new beta over 4.8 Pro and my results were identical to Blood's. The PC froze up and refused to finish booting into regular Windows. This PC is a Dell Dimension E521 running XP Pro SP3. I booted into Safe Mode, uninstalled version 5 and then reinstalled 4.8 Pro.
I tried a few days ago to install the original release version 5 and had a different result. It that case, the installation would never finish and froze on one on the last installation screens. So while there are clearly differences with the new build, it apparently still has issues...