Hi Rikki
Not sure about the sequencer, but I have found with the player that if you load the version designed for NT, and load it using the NT compatibility mode it works fine.
Win 7 Pro allows you to run a virtual version of XP in tandem with Win 7 so that there is little software that will not work, (As with all things there is not a 100% guarantee that all older software will work) however it is not available for your version
If you already have a full paid for version of XP (Not an OEM version) that you are not currently using, you can use this software
http://www.virtualbox.org/ to run it in tandem with your version of Win 7. (A bit work involved though)
Hope this helps
Bill