I have been using 3G USB stick on my laptop which has Win7 64 bit installed. It worked fine for last 1 year and suddenly one morning when I tries to connect USB it said
Please connect device. I unplugged modem and tried multiple times but system couldn't detect it.
Then I looked into device manager and it showed yellow flag on device drivers for USB modem with below error:
Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.
I re installed device drivers but no success.
I Googled about it and only solution I found is press F8 while booting and then disable driver signing. Just wondering how it worked for 1 year and suddenly stopped working.
Note: Previous day I had changed some services and set start up type as Manual, I don't really know which all services I modified. Can this be an issue?