keep getting message...

I am using Avast 5.03.396. I also run Avira AnVir Personal, at the same time, with no problem save one. I keep getting this message ever so often from Avira concerning Avast5:

Virus or unwanted program ‘TR/Crypt.XPACK.Gen [trojan]’
detected in file 'C:\WINDOWS\Temp_avast5_\unp120942777.tmp.
Action performed: Deny access

Any ideas why?

Any ideas why?
Yes....because you are running two antivirus programs

Two antivirus
http://www.bleepingcomputer.com/forums/index.php?s=ca158f47be4691ae4a493d678cd4f59a&showtopic=260844&view=findpost&p=1441638

Multiple Antivirus Apps on One PC?
http://tech.yahoo.com/blog/null/39904

Clash Of The Antivirus Apps
http://www.smartcomputing.com/editorial/article.asp?article=articles/2003/s1407/38s07/38s07.asp

You definitely need to dispose of one of those two Anti-viruses. But which one is your decision.