Has this version of LoadRunner ever worked to record web on this host? If not, then it's time to back up to the installation and execution requirements for grater than 95% of the time recording issues can be traced to either a failed installation or a failed requirement for using the ssystem.
If this is a new condition on a previously working machine then it is time to identify, disable or back out any changes made to the system since the last time you were in a working form.
James Pulley