Can I preserve this window frame?

[19nffc77]

I have this window to a downstairs toilet. The frame at the bottom has started to crumble and the glass at the bottom doesn't feel secure (it moves when pressure is applied). If I sand it all back and try to repair it would I be wasting my time? If it can be salvaged what would be the best materials to use?

 

[jj4091]

Remove the old putty and carefully remove the glass, then repair the frame with resin filler. Sand down and decorate and then refit the glass.

 

[19nffc77]

TI just started to explore what you said and on further inspection the wood at the bottom of the window from the outside is completely rotten so I don't think it can be repaired. Thanks for the reply though.