3.4 GB is more than enough to run both programs altogether. It is probably software related, it happens that some programs are incompatible with each other for whatever reason.
If it makes you crash, I would not use it while playing TO, and use something else if you would like to listen to music. This is the easiest solution, though may not be the one you are looking for. You can always try reinstalling both, though this is cumbersome and it does not guarantee anything.
And I agree with Atmosphere and his comments regarding iTunes.
Recette - Witch 400 | EmiriTachibana - Diva 400 | SakuraHiiragi - Champion 35x | AnaJessicaAyano - Soul Master 26x | LeslieSun - Witch 26x
Bye Bright Shadow Japan, I will miss you all and my bunch of characters very much ~~