quick look not working in Outlook on Mavericks

I just got a new 13" Macbook Pro. 3Ghz Intel Core i7. 

I'm running Mavericks 10.9.5 (it's my company requirement, I can't upgrade yet)

I rely heavily on quick look, viewing both documents on my desktop and direct from emails in Outlook.

For a week after i got my new machine i had no issues. Quick look worked fine out of both desktop and Outlook.

however now it has stopped working when trying to open some files out of Outlook mail.

I can open some excel, but not PPT and not TXT file. It's super annoying.

I've read different forums and tried deleting some files, rebooting and trying again.

But still not working

Can someone please please please help. It's my go to feature for getting through the day.