As export fail can result from a number of things, your freeze may not be the same as that experienced by others. To track it down, please answer a few questions...
What version of VP is being used? Try the latest. For licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old install file and registration info.
What is the resolution of the bulk of the source files - HD, 2K, 4K?
Is this a one-hour project?
What are your PC's specs: GPU, CPU, free space on the C:\ drive and type of drive?
What are your export settings?
If you take a few minutes to upload and share your work, folks here will help solve the issue. The process is easy, quick and can be private. Just follow these steps...
1. With your project on the timeline, click on MENU at the top-left. Click FILE|BACK UP PROJECT FILES TO FOLDER. Choose a folder and SELECT FOLDER.
2. Locate the saved, numbered folder and upload it to a free server - Google Drive, MS OneDrive, etc.* (Don't upload the export file or only the VPJ.)
3. Get a shared, public link. If using Google Drive click GET SHAREABLE LINK. Click the blue "Change to anyone with the link..." Then click COPY LINK | DONE.
4. Paste that link here, or click the folder, above top-right in this forum, and message it to me. This is private and won't be shared.
* Before uploading, right-click the folder, click PROPERTIES. Look at the File Size to confirm that it's not too big for the free space on the server.