Unable able to install new programs without disabling Avast 5

Avast Free Antivirus / Premium Security
1

So it seems every time i try to install a new program or update the installer crashers saying the file is corrupt, however as soon as i turn off avast the installation program works. Any solutions?

2

An odd problem. Details help. What is your OS? How did you “turn off Avast! installation”? And what program/s installer/s update/s is this affecting?

3

We do need more information from you in order to help you. As mentioned, we need information about the following:

  1. What is your OS, 32 or 64-bit?
  2. What version of Avast did you install? 5.0.677 is the current version
  3. What product of Avast did you install? Free, Pro, AIS?
  4. What other security software do you currently have or did you have in the past on this machine including antivirus (AV), firewall (FW), and other security programs? If they were in the past, how did you remove them (the vendor’s uninstaller’s tool or another way)?
  5. Did this problem just start happening or was this ongoing since you installed Avast?
  6. Did you just install Avast or do an upgrade?
  7. What were you doing when this problem occurred?
  8. Is your machine acting normally otherwise?