click here may be of use. Other than that keep the Anti Virus up to date and if possible get rid of the main sources of security exploits, namely IE6 and Media Player. Go with something that is supported, like Firefox, Opera, K-meleon and Jet Audio.
Sorry, just noticed that you already suggested that yourself. MS used to issue a CD covering all updates upto Feb 2004. Someone may lend you that for starters but you would still need all the other updates. An extra hard drive and cloning the entire system using the FREE XXCOPY is the best idea as suggested above.
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