We have reproduced the problem you reported. Please, be informed that we do not have Windows XP Embedded compatible component for creating VSP yet. Please inform us whether we understand your usage scenario correctly. You are interested in quiet installation on client PCs. Note that only OEM licence for Virtual Serial Port ActiveX Control offers an opportunity of quiet installation.
To know the pricing, to read about License types, terms of payment and delivery and to place your order for Virtual Serial Port ActiveX Control please visit its purchase page: http://www.eltima.com/purchase/vspax/
To know the price for OEM, drop a message to mailto:firstname.lastname@example.org