Signals’ sage advice should do it for you…
I’m confused though, you say this is a “new” problem?
Virtually any player should work just fine…VLC (the best IMO). Have you uninstalled and reinstalled from a new download?
PowerDVD, Nero showtime, WinDVD, etc., even WMP will all work and without av sync issues and certainly without file restrictions with NTFS.
Are you using windows 98? I don’t know of a file sysytem that would limit size to 1 GB…even FAT32 - 4 GB max, or FAT16 - 2 GB would not restrict a file size to 1 GB unless modified in some way.
Have you made any recent changes to your system?