Yes if you right click on the game file and click troubleshoot compatibility then set it to windows vista

You can try to run it in the compatibility mode. But 99% of games for Windows 98 will not work under Vista.

Generally speaking, any game that work on XP should work fine on Vista as well. There are a few games that have compatibility issues, however. MS Vista also has an option to run any program in compatibility mode (Windows XP compatibility). This helps for some programs which have compatibility issues. For any program or program short cut, right click and go to properties, compatibility to look for this option.

Yes - although you might have to set the compatibility mode up.

Yes, but you have to follow the install instructions exactly. If you have problems (some people do) run the game in any of the Windows Vista Compatibility modes.