If you still have a copy of SE4 on a HD somewhere make a backup of that, you shouldn't have to reinstall the game off of a CD unless you really screwed up some of the stock data files.
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You can give a man fire and he will be warm for a day but set him on fire and he will be warm for the rest of his life.
A* Se+++ GdQ $? Fr! C* Css Sf-- Ai% Au M+++ Mp* S@ Ss++++ RNSHP Pw++ Fq+++ Nd++ Rp++ G++++ Mm++ Bb+++@ L+ Tcp--
Get the newest Version of Invasion! here: http://www.secenter.org/
I never use an original copy, the first thing I do when I get a game is make an image, the disc then gets stored in a CD wallet, which goes only open every 6 months or so (I dont really buy many games, because i'm a rather poor college student)