a.k.a. HP Pavilion tx1220us Entertainment Notebook PC (GA647UA#ABA), tx1000z series
For official support, start here (link to the HP Customer Care website).
Specific support page (USA, English) : http://h10025.www1.hp.com/ewfrf/wc/product?product=3446449&lc=en&cc=us&dlc=en&lang=en&cc=us
http://www.shopping.hp.com/series/category/notebooks/tx1000z_series/3/computer_store
http://www.tabletpc2.com/HP--tx1000-Entertainment-Tablet-PC-Article70020228.html
HP Pavilion tx1000z CTO Notebook PC > Software & Driver downloads > Windows Vista 64-Bit
HP Pavilion tx1000z CTO Notebook PC > Manuals