Support for windows 10* will not be provided for Intel 4 Series Express Chipset.
You can check the following link for the Graphics Drivers Supported Operating Systems.
is this to buy new pc with latest intel chipset ?
Really there won't be support for series 4 chipset ? Then why windows update is trying to push me the update to win10 ?
In that case, Windows send the update to all system with Windows 7 or Windows 8.1.
The upgradeability of a device includes factors beyond the system specification. This includes driver and firmware support, application compatibility, and feature support, regardless of whether or not the device meets the minimum system specification for Windows 10.
You can check with Microsoft for further details here: