Getting error while installing sap netweaver trial version 7.2

while installing netweaver, i m getting an error Last error reported by the step :The database installer reported an error. DIAGNOSIS: Some database applications might still be running. SOLUTION: Check the log file sdbinst.log and C:\sapdb\data\wrk\MaxDBRuntimeForSAPAS_install_<date>_<time>.log.

when i checked sapinst_dev.log it contains an entry stating "The subkey 'HKEY_LOCAL_MACHINE\SOFTWARE\SAP\SAP DBTech' does not exist on the 'localhost' host"

Please help me in resolving this issue.