I want to replace my windows with XP Pro edition. When i do that, will i loose anything kept in Yaho

No. First of all, Yahoo's information is stored remotely on Yahoo's servers. Secondly, if it were on your computer, you still wouldn't lose anything if you did a basic upgrade. Using a regular WinXP disk or a Upgrade disk, you can upgrade from previous versions of Windows without losing data. Just pop in the disk and follow the instructions.

I want to replace my windows with XP Pro edition. When i do that, will i loose anything kept in Yahoo?windows 95

you shouldn't

I want to replace my windows with XP Pro edition. When i do that, will i loose anything kept in Yahoo?download ie internet explorer

No, Yahoo's information is stored on their server.

(I am assuming you speak of email messages @yahoo, and yahoo messenger contacts.)
No, yahoo isn't on your computer (unless you've downloaded/used a mail client other than using your browser to navigate yahoo! Then, if you've downloaded all your mail, you'd have to back that up to a CD or something and install XP pro.) Yahoo isn't sitting in your hard drive.
the bigger question is, replace it with what??? and why??? unless ur looking at Vista, why replace it? if ur just reinstalling, as long as you dont format the drive u shud be ok.
No, Yahoo is entirely web based. The only thing you will have to remember is your Username and Password. In fact you can us Yahoo from any internet connected computer in the world!
No. Yahoo is accessible on any computer anywhere you are..
no just save mind your desktop