Thank you for yr advise!
i tried all of them with no luck: CCleaner, Revo, FixIt (they don't have one btw for Win7, as everytime i download one it doesn't work saying "not compatible with your operational system", i mean FixIt programme for uninstalling MS 2007).
as far as i can see it with my monkey eye, there is no trace of MS 2007 left, but i might be wrong and its bits are still lurking somehere in the shadowy corners of my laptop!
also, WR2 may be right, as that trial version of MS 2007 came pre-installed on my brand-new laptop along with Win 7 as part of the full package, fully functional and cheerful. 3 months later and i need to replace it with a full version of MS myself. So seems to be a dilemma, as i cannot do it
I wonder if other alternatives would work in such situations, e.g. MS 2010, haven't tried yet, but maybe i should!