First you have to creat startup disc when you did that you have to restart your computer with the floppy inside.
You will have black window called DOS (disc operating system) then you have to type A:fdisk
you will inter a program in that program you have to follow the instruction on how to remove a partition then after removing the primery and secondary hard discs you can creat a partition for the whole hard disc
Then you have to exit the program and try to install win XP in the computer if it didnt you to type again in DOS a:format c: that all i can say to you
I hope it is useful

"دمج الهرديسك C and D"
لها مصطلح أفضل وهو إعادة تقسيم الهارديسك ليصبح قسم واحد فقط وهو السي بدلا من السي والدي

اعمل بحث في الساحة وبتحصل شرح لكل الخطوات الأتية ..

1- اعمل فورمات للسي درايف ...

2- ركب الويندوز xp

3- نزل برنامج partition magic وهو يقوم بدمج الأقراص لك ..

تحياتي