It's extremely rare to get discs 'backward compatible'. You may be able to get some software to 'trick' the Windows 98 machine into accepting a Windows 7 disc but since Windows 98 is no longer supported by Microsoft (and hasn't been for some time) you'll probably have difficulty finding a suitable converter.
Yes.
The floppy disk has nothing to do with the operating system on the hard drive. You can use a floppy disk created in Windows XP to boot a computer that has Windows 2000, Windows 98, Windows 95, Windows 3.1, Windows Vista, Windows 7, Linux, Solaris, FreeBSD, etc...
If you are interested in upgrading to Windows Vista you can find several ways to do so. One of the first things you must do is make sure your computer is compatible for Windows Vista and has enough memory. You can purchase a Windows Vista disk from a electronic store such as Best Buy. Insert the disk and select install when the prompt comes up. Follow the install wizard as instructed.
If your restore requires a windows disk then you cannot restore without one. Most do not require a windows CD. Most include the windows files in the manufacturer restore.
No.
Make sure that the disk uses a format that windows recognizes
No, you have to buy it.
For Windows 95, 98 and ME Disk Cleanup, Scandisk Defrag _________________________ For Windows 2000 / XP Disk Cleanup, Defrag, chkdsk/r
You don't the last version of windows to use the ERD was windows 2000
Yes, you can. Backup your data. Insert the disk with windows 7 and follow instructions.
yes
You can update to Windows 8 by purchasing a Windows 8 installation disk but make sure your hardware can support the update.