Problem installing ATI Catalyst Driver Package

Hello,I've been having this problem for quite some time now and though I've searched for a solution I haven't found one yet. :Cry: I have an aging Sapphire ATI Radeon HD 3870 X2 card and I'm running the 9.9 Catalyst drivers on Windows XP SP3.I decided (a while ago) to update my drivers, so I downloaded the latest Catalyst driver package from amd.com and tried to update.The package extracts to C:\Ati but the installer never starts. I get heavy HD activity for a while and nothing else.I've read it could be a problem with Microsoft Visual C++ so I uninstalled and reinstalled all the versions I had on my system (2005, 2005 SP1, 2008, 2008 SP1 and 2010) but it didn't help.I've tried different driver packages but the problem remains. :mad: Any ideas on how to solve this problem?Thank you in advance.