Yes.
Yes. Any hard drive, flash drive, or other external storage device that conforms to the USB Mass Storage device standard will work on Windows Vista.
Yes, if it's formatted to FAT or NTFS.
They are "compatible" in the sense that many applications that run on Windows XP will run on Windows Vista.
Yes. Look for ones that have a "Compatible with Windows Vista" logo on them. As of 2009, almost all new products are compatible with Windows Vista.
Yes, it's fully compatible with Windows Vista.
No the lg kc550 is not compatible with windows vista
Yes, AVG is compatible with Windows Vista.
Yes, Microsoft Office 2003 is compatible with Windows Vista.
Alcohol 120% has been fully compatible with Windows Vista since 1.9.6.4719.
Yes. The Logithech Microphone 600 is compatible with Windows Vista.
No.
Vista is just a version of Windows; the version after Windows XP and before Windows 7. If a machine is Vista-ready or Vista-compatible, it just means that the hardware and available drivers are compatible with Windows Vista. You might be able to run that PC on Windows 7 or 8, but it depends, and you would have to check with the manufacturer to find out what all it is compatible with.