Nordic, funny you should ask this is as I am a renal specialist. This is my job for a living; I also take care of dialysis patients on a daily basis. Mr. Fogarty is correct for the most part. If you want to get technical, normal BP by JNC VII (national conference on BP management and guidelines....link below) basically states that normal BP is 140/90 or better. However, to be techical, A BP of 120-139/80-89 is considered pre-hypertensive. In fact, in patients over 50 years of age, SBP (the higher number) is actually more dangerous as it conveys increased risk for stroke or MI (heart attack).
To answer your question, the reason that Advil and its variants such as Naproxen, Fenoprofren, etc are so bad if abused daily is that they have two effects on the kidney. First, they cause a depletion of vasodilator prostaglandins which are important to maintain perfusion in the kidneys. Thus, if you abuse these at length, they can cause a hemodynamic shift with a relative hypoperfusion of the kidneys (i.e. blood doesn't get to the kidneys). Long term this is bad. They also raise BP as they increase Na uptake in the kidney and once again deplete prostaglandins, which are vasodilators. Moreover, sometimes, daily abuse can actually cause an inflammatory reaction in the kidneys called Acute Interstitial Nephritis. This is often manifested by large amounts of protein being dumped out of your body thru the urine (bad...called nephrotic syndrome if you want to look it up). It can also lead to acute renal failure....usually reversible if the NSAIDs are stopped. Chronically, NSAIDs like Advil cause scarring of the kidney and decrease renal function. Thus, you get a syndrome called Chronic Interstitial Nephritis and it is ballgame for the beans. Typically, these people have irreversible kidney damage and often progress to renal failure requiring dialysis. I suspect Mr. Prince had acute renal failure from a hemodynamic mediated effect as he was probably also taking diuretics (bad combo). Well, hope that helps. I tried to make it as non-technical as i could, but it is a very complicated process. Peace.
http://www.nhlbi.nih.gov/guidelines/hypertension/