You should be fine just un-installing the old drivers.
I get so pissed off about past conflicts that after any major upgrade I format and re-install Windows XP.
Yea, overkill, but I can't remember the last time I've had a conflict because of a driver I never need anymore 
I do have one recommendation for you. If you have a nice large monitor (19"+) I would recommend trying out the massive resolutions you are now able to try. Just try em out for a week, after a week of 1600x1200 I can't go back to 1024x768, let alone 1280x1024.
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One day an Englishman, a Scotsman, and an Irishman walked into a pub together. They each bought a pint of Guinness. Just as they were about to enjoy their creamy beverage, three flies landed in each of their pints. The Englishman pushed his beer away in disgust. The Scotsman fished the fly out of his beer and continued drinking it, as if nothing had happened. The Irishman, too, picked the fly out of his drink but then held it out over the beer and yelled "SPIT IT OUT, SPIT IT OUT, YOU BASTARD!"
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