OK, I also see that the calendar and cpu meters aren't loading, either. Do you give it time to load before trying to use it?
Do you have any script blocking app running?
This is line 11, in case there is a scripter reading this, I am not a scripter.
Set objRefreshItem = objRefresher.AddEnum(objWMIService, "Win32_PerfRawData_PerfOS_Memory").ObjectSet
The CPU meter and calendar are scripted too, which is why Iasked about the script blocker, but the drive meters seem to work, and they too, are scripted.
I'll look into it.
Meantime, redownload and reload.