@johndean1940 Does the error message say what is the name of the missing DLL?
Opera 12.02 is the highest version that is supposed to be able to install and run on Win2000 - though it's unclear whether there may be problems with some Win2000 vintages. If 12.02 won't work, Opera 11.64 was the usual alternative Opera version in the past for users of Win2000.