You can do this, but it will not activate and then fail to boot in about a month.
My PC came with Windows 98SE pre-installed, so therefore I have no original Windows cd. I had to use the key number from my first Windows 98, ( which was a copy ), to activate the Windows 98SE. A friend of mine has the Windows Xp home full retail disc which he has installed just on his PC. Another friend has the OEM version installed on his PC. They both say I could use their disc to install on my Pc, but I am not so sure. Could I use either of these discs to install on my PC with no problems? Or what problems would there be?