R4 PROBLEM PLEASE TRY TO HELP!

My pokemon HG rom on my r4 got corrupted not my sav file. its because i did not know that it was possible for the sav file to get to big.So i need to delete the ROM but i cant because when i try accessing the 'game' folder on my computer it says its corrupted folder.so i try deleting it on my r4(on my ds) but the game is not showing but when i use the ysmenu it shows, when i scroll to select the pokemon game and going to press the X button to delete it it freezes. it freezes as soon as i put to bar on the game!!so if i can some how delete the game WITHOUT DELETING the sav file i would be happy. (i know how to expand the sav file to 1 mb now)or if i can somehow get my sav file to my computer that would work... maby wireless transfer(if possible)
So try ur best to help me i would really appreciate it!!

If you can copy all the games and savs except for the corrupted 1 then copy it to your computer then format your SD it should work

Replying to #2

He can't get acces to that folder.

A long shot but something to tryput micrco SD in PC via whatever means
Create a folder on desktop just to put files in
go to my computer and RIGHT click on drive that its in
Big menu choose COPY
then paste to folder on desktop
this should hopefully create a folder in there saying removable disk
open that and hopefully all your games and savs are there
format drive / micro sd
copy back apart what you dont want
all should be goodif it dont work then sorry no other idea

no luck any other ideas cause i eally want my save file since it has about 60 hours of play time. :-\ :(