If you lost the "Personal Composer" program due to a virus and need to reinstall it, you should try the following steps:
- Check if you have a backup of the installation files or any previous email with the purchase information.
- Visit the official website of "Personal Composer" or contact their support team to see if you can download the software again using your previous purchase details or license key.
- If you purchased it through a third-party vendor, check if you can re-download it from your account with that vendor.
- Ensure your computer's antivirus is up-to-date and perform a thorough scan before reinstalling any software to avoid losing it again to another virus.
If none of these options are viable, you may need to purchase the software again.