My Win 10 install failed and corrupted my laptop.  After several days, I finally got the laptop restored to Windows 7.  Now, I can't get anything to install.

My System Reserved Partition has only 19 MB / 100 MB free.  But I can't see what files are there that are using the space.  What do I use to clean up that partition so that I can do the Win 10 install which says it wants 50 MB free on the partition.

Could be this helpful for you?

http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_install/how-do-i-increase-system-reserved-currently-99mb/67febfce-29c8-4c19-a80e-04a59f36a450?auth=1