Currently I don't have Sound Forge PC installed on my computer but when running the installer it says I already have it install. There is nothing to uninstall so uninstall doesn't work. How can I completely wipe Sound Forge from PC to do a clean install?
The usual advice for situations like yours is to download and install the free Revo Uninstaller and have it search for and remove anything connected with Sound Forge.
Then, reboot your computer and retry the install of SF.