Ok so you have the project running, but windows wont let you save it -correct?
That is almost always because yo9u do not have administrator rights for the file, but you have administrator rights for the installation of lmms.
Eg you used a wrong account as you logged in, or windows says so ..
First thing
Try to save with a different name Use File | Save_as
If that does not work, look for a file named
recover.mmpz
If you have this file, it will contain the project as a backup/ failsafe version, but it is VERY important that you do NOT attempt to open another lmms project, because that will update the recover.file
If you have the recover.mmpz, just rename it to anything, and your project will be in that file
Let us know if it worked. -related:
http://lmms.io/forum/viewtopic.php?f=7&t=5686&start=10
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forgot:
Please take screenshot of errors and upload pictures