You might try disabling AVG or any other anti-trojan program running at the same time as SAS. Leave your anti-virus running (unless it is AVG) and retry the scan. Malwarebytes and SAS run well together. I've had problems with AVG. MS Security Essentials runs well with SAS. I use both a anti-virus and a anti-trojan. If it hangs up, run task manager and see if any process is taking 100% of the CPU cycles.
Same problem here after yesterdays update from mirror 1 and then red boxes during decompress and install. Task manager showed SAS process taking 100% of CPU. Working good after todays update. Will SAS Customer Service please comment?