can any one help me. I'm new to .net. i'm getting this Error - create database permission denied in database 'master' sql server 2005

Go to Microsoft Sql Server Management Studio(SSMS) , if you don't have this tool installed you can get it at the website of Microsoft when you do a search for it in the [downloads section]and install the appropriate version.
When you open the Sql Server Management Studio with your administrator account you get the name of your server on the left side and a list of folders.
Go to the security folder and inside that the Login folder. When you right click on the Login Folder you have the option to create a new Login, within the folder you have the existing Logins. Per Login you can go with right click to the properties option in the menu and you get all the options for that specific login and that's where you can grand the dbcreator (server wide security) privileges to that Login. Be aware that the right database must be selected in the user mappings also and all other settings must be ok but for that you have to look at the different pages in the left pane were all pages are listed.