I am facing a problem with some devices that are not working on my xp pc. I had formatted system due to virus problem. And then installed everything. Updated windows drivers and other stuff which looks to be working fine. I am facing a bit issue with plug and play devices. It is not working at all. I am having a Sony Vaio PCV-RZ22G system. First my USB hub has failed to work. It is not detected at all. Later on it failed to read my pen drive also. First I thought the issue was with the hub, but the actual problem lies with drivers.