Vista Windows - security

my internet explore opens at random, even if I set Google chrome as my default browser.  I sometimes play music, but no Web page showing.  Windows Defender does not open, it flashes on the screen and I can see a severe upper level alert, but disappears before I can do anything.  I am also running Sophos Anti-virus.  any ideas please?

Hi Den233,

(1) since when are you facing this problem?

(2) remember to make changes to the computer before this problem?

Method 1: Auditor of file system (CFS) scan to fix all of the corrupted system files. To do this, follow the steps mentioned in the link below:

How to use the System File Checker tool to fix the system files missing or corrupted on Windows Vista or Windows 7

http://support.Microsoft.com/kb/929833

Method 2: You can see the steps outlined in the article below

Troubleshooting of Windows Defender
http://support.Microsoft.com/kb/555957

This could be an activity of the virus,

Method 3: A scanner online for any threat and try to correct
http://OneCare.live.com/site/en-us/Center/cleanup.htm

Thanks and greetings
Ajay K
Microsoft Answers Support Engineer
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Tags: Windows

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