First of all, there are just two kinds of VPN supported by the SA device, they are IPsec and SSL.
No, for the IPsec on a Client to gateway configuration you can only use the Cisco VPN Client, the Quick VPN is only compatible with the Small Business Series and the SA is a Small Business Pro.
Now, in regards to the native client for windows that would be PPTP, and the SA doesn't support it but it can let the PPTP traffic pass through to get to a PPTP server that you can have inside your network.
I guess that if you don't want to install any VPN Client software your best bet would be to use the SSL VPN, which by default has a restriction of only two seats (You can upgrade) in contrast with the IPsec that support 50.
Here is a link on the features of the SA5XX devices:
Reboot and Factory Default Reset on ISA500 Series Integrated Security Appliances
Reboot or restart of the network device is made when certain changes in the settings need reboot or if the device is frozen. The configuration...
WAN Quality of Service (QoS) Policy Profiles Settings on ISA500 Series Integrated Security Appliances
Wide Area Network (WAN) Quality of Service (QoS) policy profiles manage traffic through classed-based profiles. These pro...
Cisco QuickVPN Installation Tips for Windows Operating Systems
For a video showing installation tips on Quick VPN, visit http://youtu.be/hHu2z6A78N8
Cisco QuickVPN is a free software designed for remote access to a ne...