SERIOUS ADOBE ACROBAT PROFESSIONAL 8 ERROR

Hi

I am using (or TRYING to use!) Adobe Acrobat Professional 8.
But every time it loads up I receive the following pop-up message:

"A serious error has been detected and Adobe Acrobat 8 Professional cannot continue. Please re-install the application and try again."

I click OK, and then another message appears:
"Acrobat.exe - Application Error
The instruction at "0x05bf1243" referenced memory at "0x12284e88". The memory could not be "written".
Click on OK to terminate the program"

I have tried uninstalling and re-installing but the error comes back!
What can I do?? Can ANYONE help?!!