Thanks you all first:
I've read carefully about your suggestion.
Here is what i've tried:
1. Uninstalled all security programs included Comodo. ( Avast5 uninstalled using aswClear5.exe )
2. redowonload the latiest version of Avast5 Pro, and installed it. reboot after installation.
Now only Avast5 in my system
..........it won't work, still got frozen when i click the mouse!!!
I'm from Taipei_Taiwan, in here has forum of Antivirus also.
I've post this question on the forum, some user did have the same problem and they didn't know how to solve it. ( They said as long as it won't crash the system, they can ignore it....
? )
I've said before, don't have such problem with other antivirus, such as Bitdefender; Avira; Gdata....etc?
?
So, i.m a little confuse...
Thanks again