Problem my samsung b7620

Hello,

i have a samsung b7620 giorgio armmani , and this morning i see that the My Storage 8gb internal dont result in menu phone. i thing that is an viruse that hide this i have some foto,video but in list of phone is no more the folder My Storage. i chek in the memory seting but there result is 0.00mb in My Storage. please can you help me. thanx.