Couldn't install usb blaster driver on HP dv4-1020us notebook (64bit Vista)

Thanks for the reply!

Yes, I tried many times by browsing different directories. If I specified the directory \x64, then it showed the error message "Windows could not find dirver software for your device". If I pointed to the directory above (i.e., \usb-blaster), then it displayed the message saying "Windows found driver software for your device but encountered an error while attempting to install it". But it didn't indicate what type of error is. At one time, I noticed the Windows says "the driver's digital signature is not certified and this version of Windows requires the certified signature to install the dirver". Wondering if this is the cause for the problem.