The home computer security is an important chapter related to the security.
From the BBC site:
A BBC investigation into net-based attacks on Windows PCs found they could happen as much as every 15 minutes.
At least every hour, an unprotected PC set up as a honeypot logged a malicious attack that could render it unusable or make it access other machines
The Get Safe Online study released by the government found 21% of respondents felt most at risk from net crime, while 16% worried most about being burgled.