Well, removing everything by hand is one way to approach this problem.I would start by unloading the sampling driver with the rmmod-vtune script in the /opt/intel/vtune/vdk/src directory. Next, try removing all the 'intel' rpms, i.e., do an 'rpm -qa | grep intel' and remove all the packages related to the VTune analyzer. (You might have the Intel compiler installed, I don't know if you do or don't. All I'm saying is don't remove RPMs that are part of other Intel products that you may have installed.) Finally, remove /op/intel recursively.
Another alternative would be to install the product on another system, tar up the /opt/sag directory, and copy it to the first system. If you replace this directory, you may be able to then uninstall the product and reinstall it.