Installed 2010 Internet security Outlook gone

I have a big problem. I just installed internet security 2010 and ran a scan. I then noticed my desktop had changed several icons where gone and it had somehow updated to Explorer 7 and outlook was uninstalled.

 

I can't find my office 2003 prof disk.

 

A. Why would this happen.

B. Am I screwed getting all my old contacts etc back?

 

I am on XP.

 

Any help would be much appreciated.

 

Thanks