Removing filestream from a database
To completely remove FILESTREAM features from a database, you need to perform the following steps.


Delete all FILESTREAM columns from all tables
Disassociate tables from FILESTREAM filegroups
Remove all FILESTREAM Data Containers (filegroup files – you might have more than one of them)
Remove all FILESTREAM filegroup (there may be more than one of them)


Walkthrough Click Here and follow his steps

Another Note: if you have Data in your FileStream file you will not able able to delete it. sp_filestream_force_garbage_collection unfortunately this only works >= SQL Server 2012
For that fix you can See the Whole Thing Here

If that doesn't work. try to make a backup for it.
That is how I cleared my FileStream file.

When it is Cleared then you can Delete it FileStream File and FILESTREAM filegroup. 

If your database in heavily indexed, you should check you Functions and View, some might go missing. (Have a Back up of that)