I've installed the Windows Vista 64 bit ultimate in my Amilo A1645 (with cpu turion MT34 and so it's the same of amilo A7645). The system don't find the sound card. Where I can find driver for Windows Vista. I've tried with no success the vinyl_v700b
There is a Vista64WDM folder in this driver package. You could try to install the drivers manually (device manager - update driver - manually select driver - etc)
If you have problems using this driver, you could try to install 32bit version of vista. Maybe 64bit is not fully supported by this audio chipset.
I've solved problem with audio in A1645 with vista 64 ultimate. I've installed manually vinyl_v700b (AMD64 folder).
Now I've the problem with memory curd bus. I need OZ711MX card bus accellerator for vista 64. I've installed a previus version for xp 64 but i can only read the memory card and only until size of 512 MB