ET was released in 2003, almost 12 years ago! Any new gen gpu no matter how slow can easily run ET. I run ET on 6 years old PC with integrated G31 intel chipset and manage to get stable 43 fps easily on maps. On small maps and small number of players I get stable 76 fps. Just turn down the graphics and resolution to medium and you will get 76 fps easily on most maps. I assume you play on hardcore server (its in your profile) so dont worry about fps. That 5500hd gpu will easily manage it. (It can play COD 4 too)
Dont make a fresh installation. Just copy the ET folder and paste wherever you want in both PC and laptop. Start ET as usual and play it. Just run as admin prvileges if using win 7/8. This works for me..
Antimony's post in Playing ET with Intel hd graphics integrated was marked as the answer