1.Try uninstalling radmin vpn if it was installed from this way: Control Panel -Programs and Features Reboot your computer Disable your antivirus Then try installing radmin vpn again
2. If the above option did not help, then run the command line as administrator. At the command prompt, type sfc / scannow and press Enter. This command will check the integrity of all Windows system files and try to fix them if any errors were found.
3.Check access to the temp folder: To assign permissions for the Windows Temporary folder Click Start, click Run, type explorer, and then click OK. In Windows Explorer, move to the <drive:>\Windows folder. Right-click Temp, and then click Properties. In the Temp Properties dialog box, on the Security tab, click Add. In the Enter the object names to sel ect text box, type <Domain or Computer name>\RunTimeUser, and then click OK. As appropriate, substitute the user name for the anonymous account you created for "RunTimeUser". In the Temp Properties dialog box, in the Groups or user names list, sel ect the RunTimeUser account. In the Permissions for RunTimeUser list, sel ect Write in the Allow column. (Read & Execute, List Folder Contents, and Read should already be selected in the Allow column.) Click OK. In the Security dialog box, click Yes.
1.Try uninstalling radmin vpn if it was installed from this way: Control Panel -Programs and Features
Reboot your computer
Disable your antivirus
Then try installing radmin vpn again
1.1 Disable digital signature verification:
https://www.youtube.com/watch?v=n8RRw9urm5E
2. If the above option did not help, then run the command line as administrator.
At the command prompt, type sfc / scannow and press Enter. This command will check the integrity of all Windows system files and try to fix them if any errors were found.
3.Check access to the temp folder:
To assign permissions for the Windows Temporary folder
Click Start, click Run, type explorer, and then click OK.
In Windows Explorer, move to the <drive:>\Windows folder.
Right-click Temp, and then click Properties.
In the Temp Properties dialog box, on the Security tab, click Add.
In the Enter the object names to sel ect text box, type <Domain or Computer name>\RunTimeUser, and then click OK. As appropriate, substitute the user name for the anonymous account you created for "RunTimeUser".
In the Temp Properties dialog box, in the Groups or user names list, sel ect the RunTimeUser account.
In the Permissions for RunTimeUser list, sel ect Write in the Allow column. (Read & Execute, List Folder Contents, and Read should already be selected in the Allow column.) Click OK.
In the Security dialog box, click Yes.
4.If it does not help, then use this link:
https://support.microsoft.com/en-gb/help/834484/you-receive-an-error-1603-a-fatal-error-occurred-dur...
https://windowsreport.com/fix-1603-fatal-error/
5.If there is a problem with the installation, then use this utility:
https://support.microsoft.com/en-gb/help/17588/windows-fix-problems-that-block-programs-being-instal...
6.If you get the "Network Resource That is Unavailable" error, here's how to fix it:
https://appuals.com/fix-the-feature-you-are-trying-to-use-in-on-a-network-resource-that-is-unavailab...
7. If there is a problem with installing / uninstalling, then try this
Microsoft Program Install and Uninstall Troubleshooter
https://support.microsoft.com/en-gb/help/17588/windows-fix-problems-that-block-programs-being-instal...
8. Clearing the cache can also help:
https://support.radmin.com/index.php/Knowledgebase/Article/View/106/0/Radmin-installation-fails-or-I...
9.If you have problems uninstalling Radmin VPN, you need to use a utility fr om Microsoft
1. Download this utility fr om the link https://support.microsoft.com/en-us/topic/fix-problems-that-block-programs-from-being-installed-or-r... and run it.
2. Click Next and select Uninstalling.
3. Select the Radmin VPN program and click Next.
4. Wait until the utility completes and restart your PC.
If it doesn't help, try using the utility https://www.revouninstaller.com/revo-uninstaller-free-download/
When asked to select a mode, select the advanced mode.