Sounds like a prank call or a scam. I wouldn't be too worried. Definitely report them if they call again.
If you had illegal stuff on your computer, you'd be in hand-cuffs and on the 6 o'clock news before anyone called you.
01/12 - Zero Boys?
01/16 - Origin w/ Trog
01/24 - Into It. Over It.
02/09 - Amon Amarth w/ Enslaved, Skeletonwitch