re-installing avast.

will i lose or retain the definition updates if i re-install avast for some reason like trying another antivirus program?

Yes, you will. But why worry? You can download them again if you come back to avast.
Which is the other antivirus you’re testing?

thanks tech. well the antivirus i’m tryin to use is “avira antivir”. just would like to see how good it is based on AV comparative results since i have a habit of testing other program if it has good reviews. but i have figured this antivir its not for dial-up users unlike other free AV program. i’ve tried so many times to update it but it’s so damn slow and can’t even connect to their server.

I’ve switched back to avast and its updated again in just a matter of minutes.

The update process of the free version is not good.
AVG free was (and I think still is) very bad for free users.
Only avast releases all the servers for the free version.