How can i upgrade my pentiium-IV media center edtion HCL beanstalk PC?

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Can some tell me how can i upgrade my pentium-IV media center edition HCL beanstalk PC to the latest configuration to improve the perfomance speed of the media center software. The first edition of media center software has lot of bugs reducing the performance efficiency of the PC...how can i upgrade so that i can get the best result of using the same software with my PC?