hi frnds...here is the solved problem to install win xp on win 7 without formatting win 7 in dell n5010

Solution  

1) Download nlite software & install it 
http://www.nliteos.com/download.html 

2) Download SATA Driver from this link 
http://ftp.us.dell.com/SATA/R254174.exe 

After downloading ---> right click on R254174.exe file--->select "Extract to 

R254174/" (Note : You can use winrar to extract the files) 

3) Place the "Windows xp" cd in the drive. 

4) Open nlite application---> click on "Browse" and navigate it to your cd drive 

that contains xp cd placed in that drive. ----> then it asks you where to save the 

files ----> just navigate to your desired location ---> click on "New Folder" button 

and select that folder --->click on OK---> Now it copies the windows xp files. After 

that click on Next--->Next. 

5) In task selection --->Click on "Drivers" and "Bootable ISO" options -->click on 

"Next" 

6) Now click on "Insert" ---> click on "Multiple Folder"----> Navigate to the driver's 

extracted location and select the folder "f6flpy-x86" ---->Click on "All" button---> 

----->Click on "OK"--->in "Text mode integration options", Select all the 5 drivers 

and click on OK--->Click on "Next". 

7) Click on "Yes" to start the process. Then click on "Next". 

8) In "Mode" option select your choice whether you want to make image or burn 

it to cd. 

9) If you want to make ISO file then click on "Make ISO" button 

10) After burning this slipstream xp, now try to install it. 

Good luck.