I'm running Windows XP (SP3)
I had an "automatic update" install itself on Wednesday evening & requiring a "re-start"
So maybe that was the last "official" update
But I won't be panicking about a lack of "official" support
I have a 3rd party anti-virus + standalone spyware
No I'm not paranoid, just careful
The operating system will still "work"
So don't be rushed into changing if you don't "have" to
I had enough trouble with Windows Vista
IMHO (I'm no PC expert) your PC will still work & providing you have "up to date" security software you need not change for the "foreseeable" future