EYG - If you think SP2 is at fault, then you could try a restore to a previous save point. If you want to try this I suggest you read this post in the Apothecary before trying the "roll back" since there are lessons to be learnt:
https://forums.totalwar.org/vb/showthread.php?t=37572
I also see Kraellin has just started a new "sticky" on SP2 in the Apothecary.
SP2 probably found its way onto your PC because you may have selected "Express Update" where Windows takes all the update "decisions" ie it installs everything (including probably SP2), as opposed to "Custom Update" where you make the decisions as to what to install. For example, I updated today the latest 5 (I think) WindowsXP Security Updates through a custom install that first strongly suggested I install SP2 - which I naturally refused!
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