stsve, goto start...run then type CMD (or command if youre not on NT/2k/XP)

a dos box will apear...

type PING WWW.MICROSOFT.COM

it should say:

Pinging www.microsoft.com.nsatc.net [207.46.156.156] with 32 bytes of data:

if the address (207.46.156.156) bit is different, then theres some shit on your PC that needs clearing... try antivirus stuff and spyware remover stuff

if it says that same address then yes, sum1 has hacked microsoft (or your ISP's cache)