Are you installing the drivers to the default location? Are you changing the download location?
Disabled all anti-virus/malware/personal firewalls?
Correct current drivers for your laptop ...who knows? You didn't supply the information needed. There are dozens of different Lenovo g500's.
I have only one firewall as said it is windows defender and i disable it, well if i go to express install it should be installing them on right place? Dont know what more information u need i am using lenovo g500 dont know which one of them but it has Intel Pentium CPU 2020m @2.4ghz, 4gb RAM and AMD Radeon HD8750 2GB thats what i can get u from box, also in display he shows AMD Radeon R5 m200/ 8500HD instead of HD8750 and says that device is working when i enter properties but if i try to do anything else it freezes, hope this is enough info im waiting for answer few more days than doing reinstall on windows again.