It always pains me to see a perfectly good computer that's been abused.
For example, consider a Windows Vista based laptop I was recently asked to give the "once over" as a favour (like many computer geeks, I'm the de facto support channel for family, friends and a few others).
While the laptop did have a security product installed, the paid subscription had lapsed with no updates in 459 days - that's just on 15 months.