Hi,
Please refer LoadRunner 9.50 Product Availability Matrix:
http://support.openview.hp.com/selfsolve/document/KM904991
LoadRunner 9.50 does not support OS - Windows 7.
And please consider to upgrade to the higher version of LoadRunner for better support as LoadRunner version 9.x is out of support now: http://support.openview.hp.com/encore/loadrunner_9-x.jsp
Regards,
Chau