Hi,
Installing ACS on VM should have 1 Gb dedicated NIC interface and supported hypervisor as per ACS version
Please find below link for reference.
Installing ACS in a VMware Virtual Machine
http://www.cisco.com/c/en/us/td/docs/net_mgmt/cisco_secure_access_control_system/5-4/installation/guide/csacs_book/csacs_vmware.html#79333
Regards
Gagan
PS: rate if it helps!!!!