Because I had the similar question recently
Re: SQL Server 2005 & SQL Server 2000 Thread #1277402

>What the hell? You replied to a post from 2002!!! Why?!?!?!
>
>~~Bonnie
>
>>>>Can SQL 7.0 and SQL 2000 reside on the same machine and live happily ever after together?
>>>
>>>Yes, I am running both on the same machine without any problems. However, I think SQL 7.0 has to be installed first, and is the default instance.
>>
>>Funny it applies to SQL Server 2000 and 2005 as well.