Installing from a jump drive to the hard drive of an infected cpu

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Hi,  I have used Avast for over five years now and I have not had anything bad happen at all.  This is great but I have friends who need your software but unfortunately they don't react quick enough and end up getting a virus.  Installing Avast to an infected machine is practically impossible.  Is there any way to download the executable to a jump drive and then install onto an infected computer from the jump drive?  This would be fantastic.  If not, do you have any other suggestions?  Please, please help. 

[essexboy]

The best bet would be to remove that main bad boys first and then put Avast on

If you are using a USB stick to transfer data then install MCShield on the Host computer (not the infected one yet)

Then using the USB stick run FRST and attach the logs here

Please download Farbar Recovery Scan Tool and save it to your Desktop.
 
Note: You need to run the version compatible with your system. If you are not sure which version applies to your system download both of them and try to run them. Only one of them will run on your system, that will be the right version.
 

• Right click to run as administrator (XP users click run after receipt of Windows Security Warning - Open File). When the tool opens click Yes to disclaimer.
  
• Select  additions at the bottom
• Press Scan button.
  
  
• It will produce a log called FRST.txt in the same directory the tool is run from. 
  
• Please attach both logs generated.

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As long as the infected computer can still read jump drives and the infection only blocks connections you would probably successful.  If you feel like this might fail run a test with a simpler program on it, install it on their and see if the virus does indeed block that too.