There could be several reasons why your computer is running slow and lagging. Here are some steps you can take to troubleshoot the issue:

1. Check for malware: Malware infections can slow down your computer significantly. Run a full scan of your computer using an up-to-date antivirus program and remove any threats that are detected.
2. Update your drivers: Outdated or corrupt device drivers can cause performance issues. Check your device manager to see if any drivers need to be updated. You can also use a driver updater tool to automate the process.
3. Clean up your hard drive: A full hard drive can cause performance issues. Delete any unnecessary files and uninstall any programs that you no longer use. You can also use a disk cleanup tool to free up space.
4. Check for software conflicts: Certain software programs may conflict with each other and cause performance issues. Try disabling any programs that you are not using and see if that improves performance.
5. Upgrade your hardware: If your computer is still running slow after trying the above steps, you may need to consider upgrading your hardware. Adding more RAM or upgrading your hard drive to a solid-state drive (SSD) can significantly improve performance.

Regarding the issue with your Radeon not allowing high resolution, make sure that you have the latest graphics card driver installed. You can also try adjusting the resolution settings in the display properties of your computer to see if that resolves the issue.

Step by step

1. Check for malware:

• First, make sure your antivirus software is up-to-date. If you don’t have one installed, you can download and install one for free, such as Avast, AVG, or Windows Defender.
• Open your antivirus program and run a full scan of your computer. This may take some time depending on the size of your hard drive and the number of files you have.
• Once the scan is complete, review the results and remove any threats that are detected.

2. Update your drivers:

• Press the Windows key + X and select “Device Manager” from the list.
• In the Device Manager window, expand each category and look for any devices with a yellow exclamation mark next to them. This indicates that the device driver needs to be updated.
• Right-click on the device with the exclamation mark and select “Update driver.”
• Select “Search automatically for updated driver software” and follow the prompts to install the latest driver.

3. Clean up your hard drive:

• Press the Windows key + R to open the Run dialog box.
• Type “cleanmgr” and press Enter.
• Select the drive you want to clean up and click “OK.”
• Check the boxes next to the types of files you want to delete (such as temporary files, recycle bin, etc.).
• Click “OK” and then “Delete Files.”

4. Check for software conflicts:

• Press Ctrl + Shift + Esc to open the Task Manager.
• Click on the “Startup” tab and review the list of programs that are set to launch when your computer starts up.
• Disable any programs that you don’t need or that you suspect may be causing performance issues by right-clicking on them and selecting “Disable.”

5. Upgrade your hardware:

• Before upgrading your hardware, check your computer’s manual or manufacturer’s website to see what type of hardware is compatible with your system.
• To add more RAM, turn off your computer and unplug it from the power source. Open the case and locate the RAM slots on the motherboard. Insert the new RAM module(s) into the empty slots, making sure they click into place. Close the case and turn your computer back on.
• To upgrade your hard drive to an SSD, you will need to clone your existing hard drive to the new SSD. You can use a free cloning tool such as Macrium Reflect or EaseUS Todo Backup to do this. Once the cloning process is complete, turn off your computer and replace the old hard drive with the new SSD. Make sure it is securely connected and close the case. Turn your computer back on and it should boot up from the new SSD.

Regarding the issue with your Radeon not allowing high resolution:

• First, make sure your graphics card driver is up-to-date. You can download the latest driver from the AMD website.
• Right-click on your desktop and select “Display settings.”
• Scroll down to the “Scale and layout” section and click on “Advanced scaling settings.”
• Toggle the “Let Windows try to fix apps so they’re not blurry” switch to on.
• Under the “Resolution” section, select the highest resolution that your monitor supports and click “Apply.”