Safe way to ensure that MSSQL 2000 or 2005 exists

Hi,
I am building an NSIS script in order to make an install cd for the
company's application.
One of the checks I have to do is whether the machine has SQL SERVER
2000 or 2005 installed.(the database engine I mean)
Is there a safe way,e.g from registry to check if one of the 2 is
installed?(I mean a certain key for both versions)

Thanx in advance!!

my English are poor :(

.

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