Heroes 3 issues under XP or Vista.

Has anyone encountered a similar problem: the game doesn't launch under XP SP2. Previously, I played "Heroes of Might and Magic III: The Restoration of Erathia" under Windows XP SP1, and there were no issues. After buying a new computer and installing XP SP2, the game installs, but it can't be launched (or rather, it launches very rarely). The computer restarts almost immediately after launching the game. After this, an error 10005 appears in the system event log ("DCOM error: Service database is locked" when attempting to start the netman service with arguments "" to start the server: {BA126AE5-2166-11D1-B1D0-00805FC1270E}), and sometimes error 1003 (Error code 1000008e, parameter1 c0000005, parameter2 bfa93b6e, parameter3 b64aca04, parameter4 00000000). I tried to find an answer to this question online, but I couldn't. PLEASE HELP SOLVE THE PROBLEM (I really want to play). I WOULD BE VERY GRATEFUL.