Try following additional options over and above whatever you have already tried -
Please try these options one by one and check after each option
Option 1: Use the ESET Sysrescue offline scanner to scan your computer
How to - https://www.groovypost.com/howto/clean-virus-in...
Option 2. Run malware scan
Run following, one of them should do the job.
Malware Bytes - https://www.malwarebytes.com/
TDSSKiller Rootkit Removal Utility - http://www.bleepingcomputer.com/download/tdsski...
RogueKiller - http://www.bleepingcomputer.com/download/roguek...
RKill - http://www.bleepingcomputer.com/download/rkill/
SuperAntiSpyware - http://www.superantispyware.com/
Option 3: Run SFC Scan & DISM
How to - https://answers.microsoft.com/en-us/windows/for...
Option 4: Restart required VPN services
Windows Key+R
Type services.msc & click OK
Make sure that the following services are exist and started.
- Remote Access Auto Connection Manager.
- Remote Access Connection Manager
If all the above services exists, try to restart them manually and then try to use your VPN connection.
Option 5: Delete Real Time Event Trace Sessions Logs.
Start you computer in Safe Mode.
Log on to Windows by using an account with Administrative privileges.
Open Windows Explorer and navigate at the following location:
C:\Windows\System32\LogFiles\WMI\RtBackup
Delete all the contents (“*.ETL” files) inside RtBackup folder
Restart your computer and log on to Windows normally.
Delete and re-create your VPN connection