Kindly check if the following steps help you:

1) Restart your PC in safe mode. You can follow this guide:

https://support.microsoft.com/en-us/windows/start-your-pc-in-safe-mode-in-windows-92c27cff-db89-8644-1ce4-b3e5e56fe234

2) Open the Run command and execute the following commands one by one:

temp – delete all the files in the folder.

%temp% – delete all the files in the folder.

prefetch – delete all the files in the folder.

3) Restart your PC in normal mode by unselecting the option to run the system in Safe Mode, then click 'Apply.'

4) Reset your web browsers:

Google Chrome: https://support.google.com/chrome/answer/3296214?hl=en

Mozilla Firefox: https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

Microsoft Edge: https://malwaretips.com/blogs/reset-microsoft-edge/

Opera: https://browsersolution.com/reset-opera-browser

Vivaldi: https://help.vivaldi.com/desktop/install-update/full-reset-of-vivaldi/

Brave: https://support.brave.com/hc/en-us/articles/360017903152-How-do-I-reset-Brave-settings-to-default-

5) Reset the Windows host file to default. You can find instructions here: https://support.microsoft.com/en-us/topic/how-to-reset-the-hosts-file-back-to-the-default-c2a43f9d-e176-c6f3-e4ef-3500277a6dae.

6) Run Disk Cleanup using this guide: https://support.microsoft.com/en-us/windows/disk-cleanup-in-windows-8a96ff42-5751-39ad-23d6-434b4d5b9a68.

If the issue persists, please contact Bitdefender support by visiting https://www.bitdefender.com/consumer/support/.

Depending on the product you've selected and the type of issue you're facing, you can get in touch with a support representative via email, chat, or phone.

If you choose email, you will receive a ticket number in your registered email. Kindly generate and attach the following logs to the ticket number you received on your registered email:

Generate Bitdefender BDsysLog: https://www.bitdefender.com/consumer/support/answer/1922/

Generate Bitdefender Support Tool Log: https://www.bitdefender.com/consumer/support/answer/1733/

Generate Bitdefender Connectivity Log: https://www.bitdefender.com/consumer/support/answer/9689/

If the generated logs are large, you can upload them to Google Drive or WeTransfer (with a 7-day link validity for free users). Alternatively, you can ask the support team to provide you with the online link and password for Bitdefender Cloud, where you can upload the logs and share the upload link with the support team.

The support team will reply to the same email within the next 24-48 hours, excluding weekends.

Regards