the statement is that vista is the most "secure, stable" operating system.
I split partition with ubuntu and vista with the latest update. Neighther has crashed, but my last installation of vista was plagued with bugs and viruses.
My process manager lost its close button (something that still blows my mind), and I recieved 25 viruses while using proprietary symantec (I now use Avira, its exceptional).
Sure, I've had to google a few problems in ubuntu, but as an EXPERIENCED user, I can do everything I need to, generally without help. It also never crashes, unless I get crazy with compizFusion (hehehe :) )
So while most people SHOULD use Vista, as it is friendly for the average user, the claim that Vista is more stable is silly.
And as far as security, Vista still has gaping problems with administration. It will never be secure until regEdit and Debug require a password. RegEdit holds passwords and I once saw a demonstration where a guy formatted a hard drive in 3 lines of text under Debug.
regEdit: edits the registry, runs in commandline as regedit
debug: Assembly Language injections into the processor. Should have been dumped on the 64 bit system. (WHY?!?!) runs in command line as debug in older systems, runs in run program as debug in vista.