The s-video socket on your PCs video card is likely to be s video
out ( as well) unless expressly stated otherwise ( as with an analogue capture card, TV card or ATIs "all in wonder" series)
That means it will output to a display but be incapable of taking an input from the camcorder
If it is possible to take an input it would have a software bundled which will help you capture.
Hi-8 is analogue video and there are examples of great analogue video but it is doubtful if these will come from a
cheap sharp camcorder:
There are "affordable" miniDV ones which would need footage captured by firewire whose output is less likely to be disappointing
but
Although to be sure, there are "poorly" made MiniDV examples , in general as a format it is likelier to give you better than Hi-8