Windows 7: Unexpected request for admin password on login

When logging in with a user account, I get a request for the administrator password every time (which I deny).
Sadly, I can't make a screenshot, but the info is something like this:

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Program name - File Operation
Verified publisher - Microsoft Windows
File origin - Hard drive on this PC

Certificate information:
Certificate purpose : windows hardware driver verification
Issued by : Microsoft Windows Verification PCA
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Is this ok to allow? It looks legitimate, but I'm in doubt because
- I think it appeared 1st time while browsing
- I don't see where any hardware change might have come from, except maybe plugging in a phone in the USB



Thanks

krek, welcome to Sevenforums!

First, make sure all windows updates are installed. This ensures the certificate is actually from microsoft. More than likely, it is a driver trying to be installed for a device, such as the phone you installed. If you are worried, do a full scan with your updated antivirus program. You can check this by unplugging all devices from your computer except for mouse and keyboard and see if it still pops up. But make sure your mouse and keyboard drivers are installed, as it might be for them. You can automatically get device drivers from windows (safe): Device Installation Settings - created by Brink

Thanks

Have to admit I needed a lot of updating. 42 updates in fact. Unfortunately I had already allowed whatever it was to install so I can't see if the certificate was invalid now, but it seems to have been a trojan.

Updates + a scan with MBAM & MSE found a 1 day old one anyway.
This appears to have fixed it.

My first bonafide virus in 5 years.. *sniff*.

At least it is gone now. Glad its getting along well, though!