I did have this problem before, but I can't find working drivers for my setup, so I'll explain the issue.
Upon trying to update my drivers via Windows' Device Manager max resolution became 1600 x 1200 while monitor has 1920 x 1080. Since something clearly failed, I decided to download official drivers for my system from https://www.amd.com/en/support/graphics/amd-radeon-hd/ati-radeon-hd-5000-series/ati-radeon-hd-5450 . I tried forcing a Full HD via CCC, but all I got was a stretched image with terrible refresh rate.
And so I downloaded a driver from https://www.dell.com/support/home/pl/pl/plbsd1/drivers/driversdetails?driverid=td8hg . Installation failed and installation wizard failed to show logs when asked to.
All I'd like to get is a working driver for the graphic card and I think everything should get back to normal.
AMD Graphics Card: ATI Radeon HD 5450
Desktop: Dell Inspiron 560s
Operating System: Windows 7 Home Premium 64-bit
Driver version installed: 15.7.1 WHQL
Display Devices: Philips 222EL2SB/00 via VGA to DVI-A
Motherboard + Bios Revision: I'm not computer savvy enough to know what it means. If you tell me how to check it, I'll do it
CPU/APU: Intel Core 2 Duo E7500 2.93 GHz
Power Supply Unit Make, Model & Wattage: Delta DPS-250AB-28 J ; Max output: 250W
RAM: 4 x 1 GB