Is that the same installing 2 difference version of sql servers on same machine?

I have read through the material online and thanks for the url.

Tried to install 2 versions (2000 & 2005) of sql server on same machine and i can see...

correct -customer expected data, eg 1000 records in a report.

Not the content of the data.

It is not a problem or corrupted data. Just want to know whether or not there is a way to tell my extracted data is correct. Any opinions? For example,...

I thought when you install a newer version of sql server and it overrides the older version on the PC. Can that be achieved when you already have sql 2000...