I have a friend a friend that has apparently picked up something that is slowing his computer way down and earlier when I was trying to goggle something it ran for better than 30 minutes with out opening the search page. I am a firm believer in Avast and at one point had avast home installed on his computers. A Navy friend of his got him to install Norton semantic that is supposedly available to anyone with navy connections; (is that possable). To make a long story short is there any way to run avast from a CD or thumb drive. Thanks Jim
Hi jsmith, welcome to the forum.
Short answer, no.
You could copy the installer to a flash drove, get him to uninstall all Norton products and run the removal tool (important) then try installing Avast, but it isn’t a portable app.
Hi…
You mean Symantec, which is the company that produces the Norton line of products. 
May God bless you 
I know about two portable security apps.
ClamWin Portable
ClamWin Portable is the popular ClamWin antivirus packaged as a portable app, so you can take your antivirus with you to scan files on the go. You can place it on your USB flash drive, iPod, portable hard drive or a CD and use it on any computer, without leaving any personal information behind.
http://portableapps.com/apps/utilities/clamwin_portable
SpyDLLRemover Portable
SpyDLLRemover is the standalone tool to effectively detect and delete spywares from the system. It comes with advanced spyware scanner which quickly discovers hidden Rootkit processes as well suspcious/injected DLLs within all running processes. It’s packaged as a portable app so you can scan computers on the go.
http://portableapps.com/apps/utilities/spydllremover_portable
Pondus told me about these
DWC http://www.freedrweb.com/cureit/?lng=en
NMC http://www.norman.com/support/support_tools/58732/en-us
Hope you have a blessed scanning!