I'm currently using NTL as my ISP, and sometimes, unplugging the modem for 2 mins will usually change the IP Address. This method includes STB's (Set Top Boxes) as well. If this fails, there is another method...
Releasing An IP Address Using Windows XP. This article is in PDF format so you can right click, save target as if you don't want it open online. Look for pages 7 onwards.
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