I have a laptop that has several USB ports (all currently in use) and one HDMI port.

I have an external monitor with an SVGA output and what I think is DVI-D. I have connected it to the laptop with a SIIG SVGA-to-USB adaptor. The monitor doesn't have a USB or HDMI output. It's old.

Unfortunately, so am I. I'm having trouble reading my laptop screen. I'd like to connect a second monitor to the laptop and stop using the built in display.. The laptop only has three USB ports. One has the SIIG adaptor, one has an external drive, and one has my mouse. I was hoping I could find a dual SVGA to either USB or HDMI adaptor, but I can't find one that isn't a switch. I could buy a second adapter, but the SIIG is also old, and I'm afraid two adaptors would "step" on each other.

Any advice would be appreciated.