Worth noting (at least as I understand it) that
you don't need to delete uplay/SH5 - just go into your web browser (all of them if you use more than one), find 'addons' (IE) or 'Extensions' (Chrome) and disable the Uplay addon, if it's there.
AFAIK, if it's not there, and it isn't for me, then there should be no problem.
EDIT: Clearer methods courtesy of RPS forums:
How to disable Uplay in Firefox:
Tools - Add-ons - Plugins - Disable the Uplay and Uplay PC Hub plugins
In Opera:
Settings - Preferences - Advanced - Downloads - Search "Uplay", delete
In Chrome:
Enter chrome://plugins/ in the bar and disable
To check the vulnerability, visit this page
http://pastehtml.com/view/c6gxl1a79.html
If your browser is vulnerable, Uplay will start and the Windows Calculator will run.
EDIT2:
Chrome lists the offending file as the following:
C:\Program Files\Ubisoft\Ubisoft Game Launcher\npuplaypc.dll
location will be different for other people no doubt, but if it doesn't show up in your plugin menus in your browsers, you can double check by searching for that file. REMEMBER: If you don't see Calculator pop up when you click the test link, you're ok!