This question is frequently asked by many folks who need a windows hosting account, but at same time supports WordPress blogs. The closest we found were Arvixe and 3essentials. Best best is Arvixe here, since we noticed performance issues with 3essentials too.
While there are many others who do support wordpress blog under a windows hosting account, performance was the main concern. This was a topic that was discussed in WordPress.org support site.
This blog is installed under Arvixe Windows hosting account and performance is not bad.
