Hi,
Thank you for reaching out to the Microsoft Community!
Based on the description, it appears that you are having difficulties with graphics card driver and getting an error “Windows cannot verify the digital signature for the drivers required for this device. “
I can understand the inconvenience you have experienced. I will certainly help you out with this issue.
Let’s try these methods and check if it helps.
Method 1: Uninstall and reinstall the graphic card drivers from the manufacturer’s website.
a.Press Windows Key + R, type devmgmt.msc.
b.Expand the graphic card, click on the drivers.
c.Click on properties, click on uninstall tab.
d.Click OK.
Method 2: You can install Windows 7 drivers in compatibility mode if there are no Windows 8 compatible drivers.
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Follow these steps:
a) Press the ‘Windows + W’ key on the keyboard.
![Intel pentium p6200 processor Intel pentium p6200 processor](https://s1-ssl.dmcdn.net/TlMVV/526x297-gZC.jpg)
b) Type compatibility in the search box and then press enter.
c) Click “Run programs made for previous versions of Windows” option from the list appeared in the left side.
d) Select the drivers and install.
For more information, visit the following link.
What if a device isn't installed properly?
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Hi,I have a Acer 4738z laptop with Intel HM55 chipset and I have 8 GB RAM and 1 TB HDD. But, the laptop's processor is Pentium Dual Core.
Is it possible to only upgrade the processor of my Acer 4738z laptop to i5? If the processor can be upgraded, I don't need to buy or invest in a new i5 laptop and I can save on my cost.
Please respond whether my laptop's processor can be upgraded and if my laptop's processor can be upgraded, please send me some reference website links of vendors who can perform the laptop ptocessor upgrade.
Please revert as soon as possible.