Try installing Everest Professional and see how it performs and what you get. It's 100% not feasible; on my PII 350, Heroes ran smoothly, along with Winamp and everything else...
Try buying a disc; it's not expensive. I saw Armageddon's Blade for 80 to 100 rubles in St. Petersburg...
For a licensed disc, it's nothing...
And there will be no glitches, and it's better to get The Shadow of Death; you can install anything on it, disable the disc requirement, and do everything else...