The drivers are readily available on the Intel Download Center. Search for "Intel G41 Express Chipset" and download the latest version for your OS architecture (32-bit or 64-bit).
The quest for an Intel Core 2 Duo E7500 graphics driver is a classic tech mystery because of one crucial fact: the E7500 processor itself does not have integrated graphics The drivers are readily available on the Intel
For retro gaming (2005–2010 titles), the Intel GMA 3100 is very weak. A portable driver won’t improve performance. Consider a (low profile, used, ~$15) for a massive boost. The drivers are readily available on the Intel
(for G41/G43/G45):
to a folder on your USB: