Open source anti-theft solution for Mac, PCs & Phones – Prey. Hidden USB Storage. I did this project without spending a dime.
If, however, you aren't privileged to have a box full of miscellaneous wires, you may have to buy some cheap items. Ingredients: Freeware startup and hijack analyzer. AntiVir PersonalEdition Classic - More than Security. Free Online Virus and Malware Scan.