Website woes

For some reason, Yahoo Sitebuilder decided to quit working this morning, leaving me without any means to update my website. After exhaustive searching/googling online to try and find a solution to this problem I came up empty-handed. I have no idea why Sitebuilder is not compatible with Windows 7 nor do I understand why Yahoo seems disinclined to fix this compatibility issue.
So what do I do?
I would be more than willing to host my websites elsewhere but will I be able to keep my domain name registered with Yahoo? If anyone reads this and has any suggestions or advice I'd be very appreciative. I never claimed to be a computer whiz and this situation has me yanking at my hair. :/