Error while installing Load runner (12.53 trial version)

I am trying to install load runner 12.53 trial version on window 7 operating system. When its validating installed softwares in pre requirement phase, it throws an error for missing windows update KB2999226. when i try to isntall this update, an alert box appears with 'this update is not compatible with your system".

Can anybody please tell me what is the pre requirement for load runner trial version 12.53 on windows 7? Am i missing a step?

Please help.

 

Thanks

Monica