I'm giving an update.. I went on my Dad's PC with the unity webplayer today and the uninstall.exe on there isn't detected as a threat.. but switch to my computer and it still detects it. Could it be that i have a old version of the uninstaller and avast thinks its malware?
Edit: I disabled avast and uninstalled via control panel, and now reinstalled it.. Its not detected no more.. It was probably because it was a old version of the uninstaller.exe