Problem with all Piriform programs...

Right so, I have an issue with all the programs from here (recuver, Ccleaner etc).

When I go to install the program, the little advert for google chrome that usually pops up in the file window keeps opening up in my internet browser (firefox) instead, so I can't continue with my install as it won't let me progress after that (the install option is transulscent and won't let me tick it). It then promptly crashes.

Now, I know it's probably something to do with my fire wall (Bitdefender), but this issue only happens on my desktop computer and not my laptop, even though they're virtually identical with how they're run and what is on them. I've tried switching bitdefender off and it doesn't seem to work.

Any help/advise would be appreciated, Thanks!