This kind of thing is why when my license expires - I'm going elsewhere! I got a different but similar problem.I have near zero tolerance for any program I pay for that gives me problems,I don't give a damn whose fault it is.
Long time user-paid subscription etc, updated last month to 22.214.171.124 / engine 126.96.36.199 , email notification today of upgrade to r7 (?), downloaded, made sure a good restore point was in place, installed, and afterwards always got a "Fatal error 3" ( sig file update listed in the log), tried a bunch of times, restored, old ( by one month) version present/active/ hit auto download-same size sig file comes in and installs fine. emailed CA, wondering if anyone else sameo-sameo..system= WinXP-Pro-Sp2, no problems, regular scans, Spyware clean, online scans yesterday, all clean now...??