A-800 PRO Driver not re-installing after uninstall. HELP!

Hi all, and thanks for your time. I am very new to this. I'll try to be brief. Bought the A-800 PRO controller, bundled with Sonar X1 LE. Installed everything, everything worked great. Decided to upgrade to Sonar X2 Essential. Installed it, and found that when I used the A-800 to play some of the virtual instruments, the sound was very distorted. I checked it with two sets of headphones plus computer speakers, and the sound was distorted through all outputs. I decided (don't know why) to uninstall and reinstall the driver for the A-800 PRO controller. Now, every single time I try to click "Setup" for the Windows 7 x64 driver, I receive the same error message: "A-PRO Driver Ver.1.0.0. A problem may have occurred. To install the driver, please execute Uninstal.exe (located in the same folder as Setup.exe, and then execute Setup.exe again." So, I execute Uninstal.exe, and try again to click Setup.exe, and the SAME error message keeps happening. It's a vicious cycle indeed. This is insanity! Why all of a sudden does the driver not want to install on my computer. I have found only 2 similar threads that describe this problem and they were not very useful. Any help would be greatly appreciated.