v9.1 is available:
- Improved pool-related routines: less disconnects, more hashrate on some pools.
- Fixed issue with some old 6xxx/5xxx cards ("lowDifficultShare" error).
9.1 gets flagged as malware in google chrome, have you added some dlls which could cause this?
In Chrome go to 'Settings' and under 'Privacy' uncheck the 'Enable phishing and malware prevention' box, that will let you download it. Just don't forget to re-check the box when you're done.