Problem Connecting old PC to TV via HDMI?

Trying to connect an old Win7 PC to a TV in my den via HDMI.

Sounds simple.. Problem is: the PC has no HDMI port and only USB 2.0

So I got a USB to HDMI adapter. The image is terrible ( square, dim, flickering at bottom third).

Just to be sure, I connected my newer PC (which has HDMI port) and the image is great.

So .. Is there any way I will get a decent image quality on my TV from a PC with USB 2.0 ???

2017-04-11T00:37:33.809Z