I had installed SQL Server 2005 on my computer 2 month ago. that worked good but when I Install SQL Server 2008 Express for 1 program I can't connect to SQL Server 2005. SQL Server Express 2008 works without any problem but I can't connect to SQL Server 2005 after install SQL Server Express 2008.

I change some option in configuration but the problem did not solved.

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How are you trying to connect? What error message are you getting? What changes did you make in your configuration? – GregD Sep 26 '11 at 19:52
Take a look [here][1] . [1]: serverfault.com/questions/58194/… – aleroot Sep 26 '11 at 19:53
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migrated from stackoverflow.com Sep 26 '11 at 19:44

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2 Answers

Do you want to install SQL Server 2005 and 2008 on the same machine ?

Should not be a problem, make sure to install the two version with two different instance name .

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Do you see both services listed in the list of Windows services? If not then you upgraded the SQL 2005 instance to SQL 2008 Express. If you do see them post listed there are they both running? What happens when you start the SQL 2005 instance?

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