AVG - Don't work

I get this error after i downloaded it.

I am currently using BitDefender, if you have a better suggestion for anti-virus feel free to post. and maybe a solution on how to fix the AVG. Don't post the same thing if someone already posted it.

 

Are you on an administrator account? Do you have enough space on hard drive?

Check these.

Blank

 

Yes and Yes, i have installed it before but uninstalled it.

 

It's either AVG messing up, or maybe other programs running on your system might be conflicting now. Try to shut everything down, don't reboot because some programs will restart, then reinstall.

EDIT: Oh yeah, or you're out of memory, but what I said above will clear that up.