Avast7 is not a valid win32 application error message

Avast Free Antivirus / Premium Security
1

Hi, I just d/loaded the new Avast7 pro program for my new computer and it won’t execute the exe file. I have run the latest Malwarebytes scan which found nothing:

Malwarebytes Anti-Malware 1.60.1.1000
www.malwarebytes.org

Database version: v2012.02.25.02

Windows XP Service Pack 3 x86 NTFS
Internet Explorer 8.0.6001.18702
Paul :: MUSIC-DAW [administrator]

25/02/2012 07:38:05
mbam-log-2012-02-25 (07-38-05).txt

Scan type: Quick scan
Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM
Scan options disabled: P2P
Objects scanned: 181563
Time elapsed: 1 minute(s), 55 second(s)

Memory Processes Detected: 0
(No malicious items detected)

Memory Modules Detected: 0
(No malicious items detected)

Registry Keys Detected: 0
(No malicious items detected)

Registry Values Detected: 0
(No malicious items detected)

Registry Data Items Detected: 0
(No malicious items detected)

Folders Detected: 0
(No malicious items detected)

Files Detected: 0
(No malicious items detected)

(end)

I have also run F-Bagle and that didn’t find anything either. Any other suggestions?

2

Avast adds a certificate to their executables. Right click on the setup.exe file → properties and look for the digital certificate signature. Is it there?

Being a new computer, do you have any pre-installed security tool? Did you uninstall it? Did you remove the remnants with the respective removal utility?

I would suggest download anew.

3

Are you sure Avast setup is download completely? Whats the size of file?