Well, on my old computer, I once did a Windows 98 install and switched to FAT32. I wasn't satisfied with what I got, so I reverted back to Windows 95 (OSR2) by completely formatting the HDD. So, during the first boot, I get a message stating "Could not initialize drive C:", but it booted Windows fine despite this. Long story short, Windows totally forgot that LFN exists, so I had to manually rename every single folder that had more than 8 letters. Everything was fine after that though.