How do I run a program as an administration program in XP?

I am trying to install Windows XP service pack 3. Had some problems, access denied. I went into the Microsoft website and followed the instructions, I downloaded and installed subinacl and paste this code (“cd /d ”%ProgramFiles%\Windows Resource Kits\Tools”
subinacl /subkeyreg HKEY_LOCAL_MACHINE /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CURRENT_USER /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CLASSES_ROOT /grant=administrators=f /grant=system=f
subinacl /subdirectories %SystemDrive% /grant=administrators=f /grant=system=f
subinacl /subdirectories %windir%\. /grant=administrators=f /grant=system=f
secedit /configure /cfg %windir%\repair\secsetup.inf /db secsetup.sdb /verbose”) and run it as an administrator program.
The problem is I don’t know how to run a program as an administrator. I am new at this stuff, please help!!!