SQL Server 2008 generate create table and fill data scripts

There's a little-known Windows registry setting you can enable that allows you to force a blue-screen crash by hitting Ctrl-Scroll Lock twice.

http://msdn.microsoft.com/en-us/library/ff545499.aspx

Maybe try enabling this, cause the system to hang, nuke it in order to force the memory dump, and look around the stack trace(s) with WinDbg after rebooting. That might give you more interesting results than trying to pick apart a hosed system in real time with Task Manager or Process Explorer or whatever.

You can perform a piecemeal restore. I'm not sure if SSMS supports it - perhaps that's why you've been unable to click your way through.

Note, however, that in case of piecemeal restore, the data residing in the not-yet-restored filegroups (filestream in your case) will be simply unavailable (as opposed to being replaced with NULLs).