Yes, you can.
SP1 is available for any edition of Windows 7.
Yes, as long as they are the same edition.
Just get the full SP2 now.
No, it's not, but you can get SP2 upgrade from Microsoft Website.
No, Microsoft only supports Windows XP SP2 and SP3, Windows 2000 SP4, Windows Server 2003 SP1 and SP2, and Windows Vista.
No.
Yes and no... Windows XP came out with more then one version. The XP versions are Windows XP Home Edition, Windows XP Professional and Windows XP Home 64bit Windows XP Professional 64 bit, Windows XP Media Center. When they say SP1 that just mean that it has the Service Pack 1 updates installed. All three versions of XP can have SP1 but still are not the same operating system software. XP Home is a basic OS for simple tasks most users need the operating system to perform. XP Pro is a advanced OS that allows a used to configure the operating system to their requirements. XP Pro and Home x64 is only for computers that have at least a dual core processor(64 bit systems.) This version is exactly the same, a little bit faster and more expensive. It is also better at multitasting
You can install Windows 7 including SP1. To only install Service Packs you will need the base operative-system.
One can download the Windows sp1 from the official Microsoft website where it is available in the downloads section. One can also download this from Softpedia and Softonic.
No. Due to the main differences (Windows 3.1 is DOS and windows XP is its own operating system), you must make a backup of your files and install windows XP as fresh, then put the files back on the hard disk drive.
Anything that runs Windows xp sp3, windows vista sp2, or windows seven sp1.
If you have Windows service pack 3, then you need to download SP3 Drivers. If you have Windows Service Pack 1, then you need to download SP1 Drivers.