How to disable Internet access while maintaing LAN?

Blake81

New member
How can I block/disable internet access for a Win7 laptop without losing my LAN connectivity (and without being able to do it on my router because my ISP won't give me access to it and insists I do it with a crappy mobile app that crashes more often than WinMe).

I got a small Win7 laptop on a KVM which I use for my older videogames. I have a folder on it shared to move stuff from my main Win11 PC to it, so I need to have LAN access to it. Problem is, the AV on the laptop (shitty AVG) is quite the resource hog, and I'd like to get rid of it, but I am afraid of doing so while still connected to internet for it could make it a vulnerable entrance to my network.

So, is there some way for me to disable the Internet without disabling the LAN on this Win7 laptop? Thanks in advance.
 

My Computer

Computer type
PC/Desktop
OS
Windows 7 Ultimate SP1 x64
CPU
Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
Motherboard
Asrock Z279 Extreme 4
Memory
32 GB
Graphics Card(s)
NVIDIA GeForce RTX 2060
Simply give it a fixed Ip and dont give it a default gateway
 

My Computer

Computer type
PC/Desktop
OS
win 8 32 bit

My Computer

Computer type
PC/Desktop
OS
Windows 7 Ultimate SP1 x64
CPU
Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
Motherboard
Asrock Z279 Extreme 4
Memory
32 GB
Graphics Card(s)
NVIDIA GeForce RTX 2060
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