I have a Windows 7 64-bit VM on ESXi 4.1. VMware tools is installed on it and the VM is at hardware version 7. I'm attempting to add a hard drive with the the SCSI controller type of Paravirtual. When I look at the Windows Device Manager, it is listed under Other Devices/SAS Controller with a yellow exclaimation point. I've tried scanning for the driver, but am not able to locate it.