Windows XP (system requirements are same for sp2 and sp1)
*www.microsoft.com/windowsxp/pro/upgrading/sysreqs.mspx
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PC with 300 megahertz or higher processor clock speed recommended; 233 MHz minimum required (single or dual processor system);* Intel Pentium/Celeron family, or AMD K6/Athlon/Duron family, or compatible processor recommended
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128 megabytes (MB) of RAM or higher recommended (64 MB minimum supported; may limit performance and some features)
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1.5 gigabytes (GB) of available hard disk space*
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Super VGA (800 x 600) or higher-resolution video adapter and monitor
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CD-ROM or DVD drive
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Keyboard and Microsoft Mouse or compatible pointing device
Windows 98
Minimum: DOS 3.31.
Reasonable: DOS 5.0 or higher. DOS 4.0 was so buggy that you're really taking a chance installing Windows 98 over it.
Processor
Minimum: 66 MHz 486DX2
Reasonable: Pentium, Pentium MMX, or Pentium II. Note, however, that Pentium Pro systems do not run Windows 98 noticeably faster than other Pentiums running at the same clock speed. The Pentium Pros are optimized for pure 32-bit code (such as you find in Windows NT), and Windows 98 contains enough 16-bit code to prevent any significant speed increases.
Memory
Minimum: 16MB.
Reasonable: Windows 98 runs much better with 24MB of RAM. For best results, I recommend at least 32MB, with 64MB being the bottom line for the truly impatient.
Hard disk free space
Minimum: The minimum amount of space required by Windows 98 Setup is 225MB.
Reasonable: A full install of Windows 98 could use up as much as 400MB of hard disk space. (See the following Note box.) Setup may also require another 45-50MB for the backup copies of your system files, and Windows 98 will need 20MB or 30MB for its dynamic swap file.
Video
Minimum: VGA, 14-inch monitor.
Reasonable: Super VGA, 17-inch monitor. Windows 98 enables you to open and work with many more applications at once than did Windows 3.x. So to maximize screen space, your video card and monitor should be capable of displaying 256 colors at 1024X768 resolution. If you plan on using Windows 98's multimedia features (such as video), a video card that can handle true color (16 million colors) and DirectX is a must. You need to install a second adapter to take advantage of Windows 98's multiple monitor support.
Peripherals
Minimum: 3 1/2-inch high-density floppy drive, CD-ROM drive, and a mouse (Microsoft or compatible).
Reasonable: If you plan on using The Microsoft Network, Microsoft Fax, HyperTerminal, or any other communications packages, you need a modem or a fax/modem. To take advantage of Windows 98's built-in sound support, you need a sound card and speakers. If you plan on using Windows 98's networking features, your system must have a network interface card installed.
*www.tdbennett.com/samples/31235-2/01/01.html
if ur system is very old...i suggest u go in for a GNOME desktop such as ubuntu. it doesnt use up as many resources as KDE.
Ubuntu :- no hefty requirements.
700mhz, 128 mb ram reccomended.
CD-ROM drive