I have dual boot on my pc...Windows 7 and Windows XP...When it asks me which one should i choose it says "Windows 7" and "Previous version of Windows"...Now i want to change that "previous version of windows" to "Windows XP". How can i do that?? I hope you understand what am i trying to say, i dont speak English very well xD....

Try using EasyBCD to manage your Win 7/XP multi-boot entries. It's a very handy tool that helps you edit and manage your multiboots options

Click on "Start"
Type "CMD" in the "Search Window" (DO NOT HIT ENTER)
"cmd.exe" with a black ICON should appear in the Window above as the only result
Right Click and select "Run as Admin"

Type the following and hit Enter to see list of commands as I'm not sure if I remember correctly!

bcdedit /?

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I'm almost certain the following will change the text as you requested:

Type the following command in the Command Prompt Window exactly as you see it:

bcdedit /set {legacy} Description "Microsoft Windows XP"
Press ENTER

To exit the Command Prompt, do not use the "X", instead, type "exit" and press Enter!

If you want XP to be the default OS, use the following command:

bcdedit /default {legacy}
Press Enter

Exit the Command Prompt.

Let us know if it worked for you.

Everything worked, thanks alot guys!!!