Please help me to resolv my difficulty on WSPR software stay

Hi guys...!

After digital modes as BPSK,RTTY and SSTV, I'm very interested by WSPR but I'm not able to install it software.
Maybe I use an old computer.After installation I click the icon WSPR it open but let appears windows saying "error" and "must closed".The programm would'nt runn and stay..! Hi..!
Is anybody else able to help me please...?
My computer is an old IBM and my system is Windows XP SP2.Many times I have tried to install it...but always the same result...Please help me guys...! Thanks so much..!