By AOMEI / Last Updated June 28, 2021


Windows 7 very slow, unresponsive and hangs

Hello people, my computer is running with Windows 7, and it started responding very slow, sometimes it just hangs and becomes unresponsive. What should I do to fix it? Thanks."

- Question from

Why Windows 7 PC running so slow?

Your Windows 7 is running slow? Whether your PC gradually became slower or it suddenly shut down, you can refer to the reasons below for this slowness.

● Too many programs and software running at the same time.
● The fragment files slow down the running speed.
● Windows 7 Visual effects degrade the performance.
● Your C drive is full which would affect system running speed.
● SSD partition is misaligned

6 Methods to speed up a slow Windows 7 computer

Firstly, you can scan your computer by anti-virus software to check if your computer got affected. Then according to the reasons above, there are 6 methods to fix a slow Windows 7 PC listed.

Method 1. Run Performance Troubleshooter

The first thing that you can try is the Performance troubleshooter, which can automatically find and fix problems. It will check issues that might slow down your computer's performance.

1. Click the Start button on the desktop, and click "Control Panel".

2. Type “Troubleshooter” in the search box. And open the Troubleshooting program on the search result.

3. In the Troubleshooting window, click “Check for performance issues”.

Check For Performance Issues

4. Then it will pop up the performance checking program, and follow the instructions and fix the detected problem. Then see if the “Windows 7 slow” problem is fixed.

Method 2. Turn off unnecessary programs

If you run too many programs and software in the background, which will take much RAM space in Windows 7. And you can access the "Task Manager" to see what program running and close unnecessary programs.

Step 1. Press “Ctrl + Shift + Esc” to open Task Manager.

Step 2. Under the "Processes" tab, you can see all the processes and applications running. And right-click on the unnecessary programs, and choose "End task".

32bit 64bit

Method 3. Defrag your hard disk

Windows 7 generates lots of small fragments on your hard drive when you use your PC. If you rarely defrag your hard drive, it is could be the cause of the "Windows 7 slow running " problem. You can try the built-in defragging program to clean those fragments.

Step 1. Open "This PC" on the desktop, and right-click on a drive, like C drive, and choose "Properties".

Step 2. Choose the "Tools" tab, and click "Optimize"

Step 3. Analyze all the drive one by one, and click "Defragment Disk".

Method 4. Shut down visual effects

If Windows is running slowly, you can turn off the visual effects to ensure the performance. Here are the steps below.

Step 1. Press the "Windows key + R" shortcut to open the Run command. And type "sysdm.cpl" and press Enter to launch System Properties.

Step 2. Click the "Advanced" tab, and under Performance, click the "Settings" button.

Step 3. When the "Performance Options" opened, check the "Adjust for best performance option" to disable visual effects.

Method 5. Extend system partition

If your system partition is getting full, Windows 7 will run very slow, in this situation, you can find a way to extend your system partition.

You can turn to the comprehensive disk management tool, AOMEI Partition Assistant Professional, which can help you to extend your C partition with free space from another partition or unallocated space. And it also supports creating, shrinking, moving your partitions for managing your disk. You can download the Demo version to have a try firstly.

Download Demo Win 10/8.1/8/7/XP
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Step 1. Install and launch AOMEI Partition Assistant Professional, click "All Tools" in the Wizards and choose "Extend Partition Wizard".

All Tools

Step 2. Choose Extend system partition and then click Next.

Extend Partition Method

Step 3. Choose the partition you want to release free space from. Then click "Next".

Select Partitions

Step 4. In this window, you can specify the new size of the system partition by moving the bard, and click "Next".

Extend Size

Step 5. You can preview the task, and click "Proceed" to perform the operation


Method 6. Align SSD partition

Partition misalignment is another very common reason why Windows 7 runs slow. It causes slowdowns in performance. And AOMEI Partition Assistant Professional could allow you to check whether SSD partitions are aligned, and enable you to realize partition 4K alignment easily.

Step 1. Install and launch the software, right-click the SSD partition and choose "Advanced" > "Partition Alignment".

Ssd Alignment

Step 2. You can set partition 4K alignment in this mini window. Usually, we recommend the "2048 Sector". And click "OK" to continue.

Partition 4k Alignment

Step 3. Finally, click "Apply" to save changes.

Apply Alignment


This is how you can fix “Windows 7 slow”. I hope the 6 methods can solve your problem. If they can't, you can  you might need to consider to get a new internal disk. and transfer OS to a new hard drive by AOMEI Partition Assistant.

✍Note: If your computer is running with Windows Server system, you can turn to AOMEI Partition Assistant Server Edition.