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Laptops are usually shipped with pre-installed windows XP. The Windows within them is OEM and licensed. So there is not need to install Windows again on the same machine. Moreover you can update windows from Control Panel->Windows Update (On the left banner). This will scan your machine and install all the required updates. There is Windows XP SP2 available on the internet. Try updating your machine by using Windows update from Control Panel. To check whether the windows installation on your machine is licensed, try the following steps: Open System properties by pressing Windows+Break button together. Here you will see the information about your machine. Also Registered to: area shows to whom your windows is registered. Moreover you will also find a product key having format something like this 55274-640-8252092-23317 ?????-64?-???????-????? Check that if your product key contains any number other than 640 means that your windows is not licens

Following are the steps for using Praat with Visual C++: Download Praat from http://www.fon.hum.uva.nl/praat/praat4216_winsit.exe Download SendPraat from http://www.fon.hum.uva.nl/praat/sendpraat.exe Extract both Praat and Sendpraat in to location e.g. D:\praat It should look some thing like this: D:\praat\praat.exe D:\praat\sendpraat.exe Now Right click My Computer icon and click Properties or Press Windows+Break Button together. A “ System Properties ” Dialog will appear. Select Tab “ Advanced ”. At the bottom there is button “ Environment Variables ”, click it. A window appears with two frames. In the “ System variables ” frame double click the Variable namely “ Path ”. In the “ Variable value ” textbox append “ ;D:\praat\ ” (don’t forget to use ; to separate from previous path). Restart your computer After doing this open “ Command Prompt ” by typing “cmd”