After installing and opening PS6 I get
'Runtime Error! R6034 An application has made an attempt to load the C runtime library (Win7 64bit)'
Clicking on this it will come back seven times, after which PS6 starts.
Following up on all the advice from Adobe Forums and Microsoft I've tried the following:
Checked all my updates
Checked for viruses and malware
Run CCClean and SysMechanic
Run Adobe Creative Suite Cleaner
I've also reinstalled the MS runtime library, tried to start in safe mode, all to no avail.