system
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there is, in the HJT folder, as long as its not on desktop , a backup log of all your logs generated . any of these can be used quite simply as i understand to return /restore to a point where log was generated .
This is a link to a tutorial on HJThttp://hjt.wizardsofwebsites.com/
and this is a link to the analysis generation which also has links to forums specific to HJT http://hijackthis.de/index.php?langselect=english