Hi,
Bloatware - large amounts of code / apps that that take up cpu and ram time as well as disk space entirely needlessly.
This is not an area that I know much about - but from what I've read vista could be said to suffer from bloatware i.e. loads and loads of 'features' that are not needed, add no real value to the computing experience and in the worst case scenario cause conflicts on the machine that result in BSOD. I believe (but please don't quote me on this) that XP also suffers from this phenomenon. From the reading I have done it appears to be an accusation levelled at Microsoft operating systems regularly and is one of the reasons to transfer to any Linux flavour of your choice (I've chosen Ubuntu on and old laptop).
I have heard of people who have delved into XP and removed large portions of code that they don't want with significant reductions in disk space and (I believe) conflict issues.
As I've said this is not an area that I know much about - that's the reason that I'm posting on a web forum about it!
Will.