parport.sys - usually located in C:\Windows\system32\DRIVERS\
Drivers written for Windows Vista are not backwards-compatible with Windows XP. Most hardware that has a driver for Vista should also have a driver for Windows XP.
Yes.
No.
That particular driver is not available yet.
Many wireless adapters work with Windows 7. If the product does not have an explicit Windows 7 driver, the Vista driver should still work.
Yes it is. You will need to download the latest driver if Vista doesn't go look for it automatically.
nowhere
Not always. While it may work, depending on the quality of the driver, it is far better to obtain a Vista-specific driver. Vista introduced a new TCP/IP stack and NDIS (Network Driver Interface Specification), so the old driver may not perform as well.
That edition of Windows Vista does not exist. Windows Vista exists in two editions for home users: Windows Vista Home Basic and Windows Vista Home Premium.
my window is expedia, not vista.
No your windows 7 will not deleted
No. Obviously, if you upgrade to Windows Vista, you will have Windows Vista.