Many window shops can fix them or you can do it yourself. Not difficult, just time consuming. You have to get the right spacer strip. It comes in different widths to match the spacing between the panes of glass. I fixed mine without totally separating the two panes. I cut the spacer strip out of the top and bottom and pulled a rag back and forth with a coathanger to clean the two inside surfaces then slid the new spacer strips in. There is a second sealer in a caulking tube that you apply that really does the final seal. CL Laurence produces what you need and has instruction sheets.
This is what you are looking for (but in the width for your windows).
https://www.amazon.com/C-R-LAURENCE-SS31666-Edgetech-Spacer/dp/B0149J3L6C/ref=sr_1_1?ie=UTF8&qid=1516240360&sr=8-1&keywords=cr+laurence+spacer