By Delia / Last update December 13, 2021

Scenario: the file cannot be accessed by the system

Ran a clean rebuild of my system on SSD, now cannot access any exe's on HDD (Drive D). I get "the file cannot be accessed by the system".

There are always some problems during the use of the computer, such as the file cannot be accessed by the system or the folder access denied. Why does this happen? How to solve this problem? Let’s look into it.

Why the file cannot be accessed by the system?

In general, the folder access denied is mainly due to insufficient virus or administrator privileges.

1. Computer virus

Computer virus may come from the connection of unsafe network or the use of unclean external hard drive. If there's virus hidden in certain folders, it may damage the administrator privilege and cause the folder access denied. Therefore, if you encounter a folder that access denied, you can check if it is caused by the virus. Usually, some mainstream anti-virus software can be used to fix such problems.

2. Insufficient administrator privileges

Many computer users may not use an administrator account but use a guest account to log in, and it resulting in some system important files cannot be accessed by the system. If you are experiencing this type of problem, you need to check user permissions. In addition to this, it also can be caused by the administrator did not add permissions for this folder.

Solution to file cannot be accessed by the system: add permissions

If you encounter file cannot be accessed by the system, you can add permissions for the folder to fix this error. First of all, please make sure that you are log in by administrator account, and it is not inaccessible by the virus. Then do as the guide below:

1. Right-click the folder and then click “Properties” > “Security” > “Edit”.

2. After that, find the currently logged in account. Click it and tick “Full control”.

3. Then, click “OK” and apply this operation. Thus, you can access this folder.

Measures to prevent data loss due to file cannot be accessed

In order to protect data security and avoid data loss after infection, we should develop the habit of regularly backing up system files and important data. How to backup files? Here provides you two methods to do this operation.

Method 1. Back up files with Windows built-in tools

1. Press “Windows” + ”R” to open the Run box, type “services.msc” and press “Enter”.

2. Then, find “Windows Backup” in the pop-up window and double-click to open it.

3. Find the “Startup type” item in the “General” tab, and change it to “Automatic” in the drop down menu. Then click “Start” in the service status below, click “OK” to exit.

4. After that, restart your computer. Open the control panel to find “Backup and Restore” and click it.

5. In the pop-up window, click “Set up backup”.

6. Then follow the prompts to complete the backup.

Method 2. Back up files with free third party software

If you think backup files with Windows built-in tool is complicated, you can choose a third party software to complete the backup operation. Compare with other software, here I highly recommend AOMEI Backupper – a free powerful software which allows you to back up your files, folders, hard drives, partitions, etc. In an easy way. You can also do incremental backup and differential backup. Once the computer has a problem, you can easily restore the system and data to a normal state. Let’s see the specific steps:

Download Freeware Win 10/8.1/8/7/XP
Secure Download

Step 1. Download, install and run AOMEI Backupper, select backup in the left sidebar. Then click “File Backup”.

File Backup

Step 2. Click "Add Folder" or “Add File” button to select the files you want to back up. And then, select the destination path to store the file backup images. Click “Start Backup” to lunch the progress.

Add Folders or Files

Start Backup

* Before starting backup, you can set more for the backup with two options below.

Options: You can set more for your backup. Such as adding a comment so that you can distinguish them easily, enable email notification to get email or SMS notification, split, compress, encrypt (paid) the file backup image, etc.

Schedule: This function can help you set an automatic file backup for daily, weekly, monthly, event triggers, USB plug in (please upgrade to AOMEI Backupper Professional to enjoy the last two features), and it can help to do an incremental or differential backup.

Step 3. When the progress completed, click “Finish” to exit.


To avoid data loss caused by error 0X80070780 the file cannot be accessed by the system, backup data regularly can be a useful way. And AOMEI Backupper can be the best file backup software. Besides file backup, it also supports system clone, disk backup, partition clone and so on. If you want to system clone, you can upgrade to AOMEI Backupper Professional.