There are four major versions of Windows 95 and, at the time of this writing, three versions of Windows 98. They are generally referred to as follows:

Windows 95

Windows 95A

Windows 95B

Windows 95C

Windows 98

Windows 98SE (Second Edition)

Windows 98ME (Millennium Edition)

And, of course, there is now Windows 2000 - (Not recomended for home or small business users.)   And Windows XP - (To date, XP is a little buggy, and should not be considered an upgrade.)

To determine what version of Windows you are currently running, perform the following steps:

Right-Click once on the "My Computer" icon.

Left-Click once on the "Properties" choice.

Microsoft Windows nn (Where nn is 95 or 98)
A series of numbers... (See below)

4.10.1998 = The original version of Windows 98
4.10.2222A = Windows 98SE (Second Edition)
???? = Windows 98ME (Millennium Edition)

Windows 95, the original version, had a few bugs that could interfere with your connection to the Internet. Windows 95A fixed most of these troubles. Windows 95B added USB "Universal Serial Bus" support. Windows 95C fixed most of the remaining bugs, and was By-Far the most stable version of Windows until the release of Windows 98SE.

Windows 98, the original version, had a lot of bugs. Windows 98SE cured most of the bugs. It's still too early to know how Windows 96ME will fair.

PLEASE NOTE: If you are considering upgrading your computer's OS to a later version, see Should I Upgrade before doing so.

Just pop the CD in your CD-ROM drive and, in the blue CD-ROM window that appears, click Browse This CD. Right-click Setup.exe, select Properties, and in the resulting dialog box, select the Version tab. There, you'll find the file version. (You can also select Product Version under Other Version Information.)