How does one go back to OS2007?

I updated to OS2008 but have found that the RSS readers doesn't work as well and web pages are constantly getting hung up. Also the N800 still doesn't stream windows format (the three things I use this for). I'd like to wait until OS2008 works out some bugs -- it does look great though.

Can I put the old OS on using the updating software that came with the N800?

Thanks