how would i know if i had a virus on my computer deleting my media files, pictures and music

[c=005E2F][i]how would i know? would such a virus delete all my media files in one go, or one by one gradually over time?

i want reassurance really, the reason i ask there seems to be less media files on my computer than i thought, i thought i had more than what i see/ have....or pehaps i'm imagining it and there was always this amount of media files and nothing has been deleted.


either way can anyone help?[/i][/c]