If you have not upgraded your old windows version (windows xp 2 or windows vista RTM) to a latest version of windows (windows 7 or Windows Vista SP1) then you may faced some problem in near future because Microsoft is soon going to stop Support for Windows Vista RTM and Windows XP SP2 (Service Pack 2).
Support for Windows Vista (without any service pack installed) will be ending on April 13, 2010, meaning users must be running Vista SP1 or SP2 to receive any further product support. Users can upgrade to the latest service pack, SP2, for free, providing them with the latest security updates.
Support for Windows XP SP2 will be ending on July 13, 2010. Users still running Windows XP SP2 will no longer receive updates after this date, and are urged to update to Windows XP SP3, a free upgrade, or switch to Windows 7.
Users running Windows XP SP2 64-bit will still receive product support up until April 8, 2014, since Microsoft never released a 64-bit service pack 3.