If you need to scan virus on Prayaya V3 system, you can simply do it by using the system anti-virus software to scan the whole Prayaya V3 folder, so you don't need to install anti-virus program in Prayaya V3 virtual system, just install it in host system.
One advantage of Prayaya V3 is that even if Prayaya V3 gets a virus, it will not affect your host computer because Prayaya V3 is independent of system drive, so it will not affect the host computer.
We also want to clarify that Prayaya V3 as a virtual system, it does not support installing and running anti-virus program on it very well. So we suggest you to use a host computer which has an anti-virus program to run Prayaya V3, or just install some small protection programs on it such as ClamWinPortable、a-squared Emergency USB Stick to protect V3.