VHS to PC: Can't get a steady signal

[L0r3n20]

Hey there, newbie here.

Some time ago I bought from Amazon a video grabber "V-TOP" which I used with Windows 7 with a few to no problem. It rested there for a while but, since I have A LOT of old VHS (home made) I'd like to convert, I reinstalled it on my new (win 10) pc.

Here come the problems. I tried both with ArcSoft ShowBiz and with OBS with the same result: I can't get a good signal. In fact, the video signal keeps "jumping" back and forth a couple of frames even without a VHS inserted. I tried every PAL/SECAM/NTSC setting with no luck (Italy should be PAL B).
I have no problem using a TV.
The VCR I'm using is a Thompson DTH6100E (it's a combo DVD/VCR) and the video (and audio) signal is grabbed through AV (the grabber has also an S-Video in but the VCR doesn't).
These are my specs: Windows 10, Intel Core I7@7700K - 4.20GHz, 16Gb RAM, 450Gb SSD + 1TB @7200RPM, NVidia GTX 1080

Hope someone can help. TIA

[Barrythecrab]

Right out of the gate, OBS is universally frowned upon for capturing analog signals. VirtualDub 1.9.11 (?) is often recommended.
Go back to Windows 7 and get a better capture device.
After I quit torturing myself in W10 I reactivated my P360 ( 2.3GHz) Dual Core W7 lappy and never looked back.
It helps to have some TBC in the workflow, too.

[L0r3n20]

Thanks, I guess I'll give it a try

[Barrythecrab]

To be clear, I use the W7 laptop for capture only, I still use my W10 HP tower for the power editing.
MY capture devices are Diamond VC-500, a Hauppauge 850 and 950, 2 Tevion DVD Makers, and a Vidbox, and they all work GREAT in W7.