config file being infected

Firefox 12.0. Window Vista Business SP2.

My new tab page is being reset to "".

First I assumed this was a one-off and went into "tools", "options", "general" tab, "home page" and reset it back to my usual preference "about:blank".

The next time I restarted Firefox it had reverted to the u-search entry again.

I've spent the afternoon scouring the net for a solution and was advised, amongst other things, to check various entries in "about:config". Sure enough there were seven different u-search entries (listed below), which I modified back to default settings. Yet the config file entries all reverted back to u-search on restart.

browser.newtab.url : : u-Search : u-Search : : u-Search browser.startup.homepage : keyword.URL :

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