Wait until HP releases their own driver for Win8, personally, I prefer Win8, not for the looks, but I think, under the hood it's a much better, more efficient OS. If you need to transition to the "start" screen, then goto stardock, download Start8 ($5 IIRC), restores the start button. best $5 I ever spent.
Anyway, I've always had better luck with laptop drivers being from the laptop manufacturer. and while yours isn't a laptop persay, it's a laptop in a desktops body. 
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=4132&lc=en&cc=us&dlc=en&sw_lang=&product=5049558#N173
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