Let's make a few things clear.
CAPs are cumulative. You're only recommended to uninstall the old one when you install a new one, because it would create multiple entries in your add/remove programs list. Why? Because of the stupidity of both Microsoft and AMD.
CAPs are built into the drivers as well. The separate package was invented for a simple reason. When a new game gets released, it's easier to make a new CAP package than recompiling the whole driver set. In reality it doesn't work of course, as AMD is usually very late for the party when there's a new game, and also usually needs a hotfix driver as well to make it playable.
However, the theories are still in place.
Suggestion: Forget about CAPs, install the latest non-WHQL (called beta) drivers everytime. Or don't update your drivers only your CAPs.
CPU: AMD Phenom II X4 810 @ 3250MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 850/1150MHz | Display: L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 7 Pro x64
CPU: Pentium 4 Northwood S478 @ 3200MHz | RAM: 1,5GB DDR 400| MoBo: Gigabyte GA-8S661FXMP-RZ | GPU: ASUS Radeon X1650 Pro 256MB | Display: Dimarson 19" CRT | PSU: Noname 400W | OS: changing twice every week...