Windows in romahom

I think I may need Woodys advise here

Not sure where the rest of my post has gone???

Ok it looks like my windows are leaking when it rains, only a tiny bit but none the less.
It is an older type Romahome with sealed windows.
Is it easy to reseal these windows
Or
Can I buy some new windows that open?? This would be my preferred choice.

And just to let you all know that I resealed my Fiamma skylight the other week. Took it out. Got rid of all the old sealant and resealed with Mastic tape, successfully!!!
What a job!!!