MS update gives some XP boxes the Blue Screen • The Register
basically, if you run win XP there is an update that is worth de-selecting from Updates till more is understood about why it can cause some XP machines to blue screen and need rollback to recover.
The MS refence is MS10-015
Also Adobe have released a patch to Flash and AIR ( used by iplayer!)
http://www.theregister.co.uk/2010/02/12/adobe_updates/
Play safe out there!