I am running the last version of 6.3.x.x as I have DVD recording problems with 22.214.171.124 and 126.96.36.199 does not allow overburning (even when selected).
The DVD problem consists of the time counter on my DVD player just stopping at 7 seconds and then I am unable to do anything but watch the movie (all buttons except power fail to do anything)
I burnt the same DVD files in 6.3.x.x and it works fine.
However that is just me & my setup. If 188.8.131.52 works for you then use it.
Just remeber that an A64 running XP Home or Pro is still only 32bit & XP64 is still only a BETA product.