I prefer not to have my operating system BSOD with additional software. Why do you use avast then?
It also BSODs... and have memory leaks...
I don't use Comodo Time Machine!
The last BSOD I had was on my XP Pro system with MBAM when avast V5 was just released and it was fixed quite promptly by AWIL support.
E5200 2.5GHZ, 4GB RAM, 320GB HD, Windows 7 Home Premium 64bit, avast! V9.0 Free, IE10
P4 2.8GHZ, 1.5GB RAM, 40GB HD, XP Pro SP3 32bit, avast! V9.0 Free, Google Chrome
with hpHosts, MVPS HOSTS files, SpeedFan, WinPatrol PLUS