How to solve dwm.exe-nodisk there is no disk in the drive.please insert a disk into the drive \device\harddisk3\dr3

I suggest you to run the following steps and check if it helps.

Method 1:

To resolve the issue, use one of the following methods:

Change the drive letter assignment for the removable drive to a letter other than C.

To change the drive letter assignments in Windows 7, follow these steps:

1. Log on to the computer as Administrator.
2. Insert a disk in the removable drive.
3. Click Start, right-click on Computer, and then click Manage.
4. Click Disk Management.
5. Right-click the partition, logical drive, or volume that you want to change, and then clickChange Drive Letter and Paths.
6. Click the removable drive, click it, click Change, click the drive letter that you want to use, and then clickOK.

Read more here:

Change, add, or remove a drive letter

http://windows.microsoft.com/en-US/windows7/Change-add-or-remove-a-drive-letter

Method 2:

Use check disk command for any errors on hard disk -

Warning: Microsoft does not recommend interrupting the CHKDSK process. Microsoft does not guarantee the integrity of the disk if the CHKDSK program is interrupted .For safety you can back up your data before using the check disk command.

Use the check disk commands as follows:

a. Click on the start button, In the search box type” command” and click on the “Command prompt” in the search results listing.
 b. In search window type 'cmd' and ENTER. Right click and select 'Run as administrator'.
c. Type at the command prompt CHKDSK /P and press ENTER to scan the disk.
d. Then type CHKDSK C: /F /R and press ENTER to repair corrupt sectors, if there are any.

NOTE: The root drive has to be C: and the command may schedule a task at the system startup, if it does, then press Y to schedule a task and restart the computer to perform chkdsk.
Once chkdsk completes, boot to the desktop and then check.

Important: While performing chkdsk on the hard drive if any bad sectors are found on the hard drive when chkdsk tries to repair that sector if any data available on that might be lost

Method 3:

Run SFC / Scannow. Please follow the below steps:

Run the System File Checker (SFC) scan. Follow these steps:

a. Click on the start button, In the search box type” command” and click on the “Command prompt” in the search results listing.
b) Type the following command, and then press ENTER:
sfc /scannow.
The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.

Hope this helps. If you face any Windows issues in future, let us know and we would be glad to assist you.