Not all malware can be removed the way you remove that antivirus demo. From the Der Spiegel article[1]:
> Take, for example, when they intercept shipping deliveries. If a target person, agency or company orders a new computer or related accessories, for example, TAO can divert the shipping delivery to its own secret workshops. The NSA calls this method interdiction. At these so-called "load stations," agents carefully open the package in order to load malware onto the electronics, or even install hardware components that can provide backdoor access for the intelligence agencies. All subsequent steps can then be conducted from the comfort of a remote computer.
Naturally, if they also load a keyboard logger or whatever, no amount of formatting that new laptop would help.
> Take, for example, when they intercept shipping deliveries. If a target person, agency or company orders a new computer or related accessories, for example, TAO can divert the shipping delivery to its own secret workshops. The NSA calls this method interdiction. At these so-called "load stations," agents carefully open the package in order to load malware onto the electronics, or even install hardware components that can provide backdoor access for the intelligence agencies. All subsequent steps can then be conducted from the comfort of a remote computer.
Naturally, if they also load a keyboard logger or whatever, no amount of formatting that new laptop would help.
[1] http://www.spiegel.de/international/world/the-nsa-uses-power...