invalid handle

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    Windows 7 Handle is invalid when printing

    I have a HP M1530 printer working fine on Windows 7. I get the error the handle is invalid after I update .Net framework to V4.0. I tried to install latest printer driver, still no luck. Any ideas? Thanks.
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    Windows 7 Can't print over wireless network.

    My Windows 7 laptop is connected to a wireless network, with the other computer running Windows XP. My laptop has detected and installed the printer on the wireless network (HP Photosmart C4600), and says it is Ready. However, it still won't print. The furthest I've gotten is when the status...