Yahoo Messenger Not Working

Hello,

Recently I downgrade the windows before it was running Vista premium home edition in which i facing too much problem then i compelled to change in windows xp. when i put the xp cd and the run through Cds ofter upload neccessory files when i enter for instalation xp msg come there is no hardisk then i search here and i find the solution i went to setup and change achi to ata but when i do change achi to ata msg come before to change this setup first disable flash cashe module so i went there and i enable flash cashe module then change achi to Ata then save and exit then i install xp okie fine i done all the process till to install of xp now its working proper way .. i want to one thing which changing were made before installation of xp suppose achi change to ata and flash cashe module disable so ofter installation of xp we need to change again and bring them in first possible achi and flash cashe module enable

When i trying to install Yahoo messenger its give me error incurrep and same also happen with msg messenger also so any body can tell me plz ... what i should to do to solve this problem ... i give screenshot also

https://i69.servimg.com/u/f69/13/39/69/26/screen13.jpg