Products & Services
and welcome to the Forum.
"How can I order F-security for only one pc?"
Windows or Mac versions? F-Secure Antivirus or the Internet Security suite?
To add to Blackcat post, assuming that you are using the Windows version, please purchase it online from here:
Internet Security suite:http://www.f-secure.com/en/web/home_global/internet-security?icid=848
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To add to Fendy's post;
If you have a smartphone/tablet you could also try F-Secure Safe; http://www.f-secure.com/en/web/home_gb/safe#pricing
"Can you install it into my computer"
No, but just follow the simple instructions here.
When you have a valid subscription key, check the installation information here; http://www.f-secure.com/en/web/home_global/support/installers
If you are asking about installation instructions, I am supposing you have not installed the trial version; if this is the case, try before buying;
see for example http://www.f-secure.com/en/web/home_global/internet-security#trial