Firefox (& Safari) open incorrect (undesirable!) website or I get a 'server not found' message.

Firefox (& Safari) redirect both Google searches and web addresses to an undesirable Chinese website (www.5542.com). They have both become very slow and often give a 'Server not found' message when accessing various sites. I believe it could be malware(?) or similar. I've tried to block the unwanted site but it keeps on appearing. I'm running two macs and it's happening on both of them. I'm not especially experienced with web jargon etc. so please speak slowly with any instructions! Thanks for your help. Andy
== This happened ==
Every time Firefox opened
== 3 - 4 weeks ago

Thanks for your help Moses but these Malware removal links are for Windows and I'm on Mac OS 10.4.9 on the laptop and 10.5.6 on the main machine.
One of the problems is that I can't do too much Googling for help before I run into the www.5542.com or 'Can't find the server' problems. Any more suggestions or other useful forums I could try?
Andy

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