Microsoft XP update cripples IE6

Spotted on PC Pro:

Patch Tuesday paralyses Internet Explorer

Last week’s critical security update to Internet Explorer has crippled the browser for many users. The problem is reportedly affecting Internet Explorer 6 users on Windows XP. The fault causes the browser to crash in a number of different scenarios, such as when printing web pages.

Read the full article.

But why are people still using IE6 under Windows XP?  Why haven’t they at least upgraded to IE7? Or better still moved to a better browser, such as Mozilla Firefox or Opera?