It's been a while (several months) since I had a look at it but if I recall correct I didn't even find the options to enable file and printer sharing, only home groups. The settings screen looked completely different from the ones on my laptop, I had them side by side to try to mimic my laptops settings on her laptop.
Nope. I have Homegroups off in Win 7. Am able to create and use shares from other windows, Linux, and NAS. I used to share a USB printer but now my printer uses Ethernet/WiFi and is visible to all. My NAS has software to make the printer appear to the iPad since Apple won't joint the standards.