Need help with Read-Host

I have a script that installs java. In the script I have a line of code that works properly:

$sb={
Start-Process 'C:\Temp\jre-7u25-windows-x64.exe' -ArgumentList '/s' -verb runas -Wait}

It starts a process named jre-7u25-windows-x64.exe, that I can view in task manager, and java is successfully installed silently.

Now I am working with Read-Host parameters so that the script prompts me for the names and locations of files, so I do not need to modify the script. Everything in my code is working properly except this line. What I would like to have working is this:

$process = Read-Host 'Enter the name of the .exe being installed ie. Java.exe'
$arglist = Read-Host 'Enter the switches to be used ie. /s /qn'
$sb={
Start-Process "C:\Temp\$process" -ArgumentList "$arglist" -verb runas -Wait}  

This way, the $process and $arglist can be variables, which can be modified when the box pops up asking for input. However, it's not working and I'm stumped. Here is ther error I'm getting:

This command cannot be executed due to the error: No application is associated with the specified file for this operation.

I also get the same error if I remove the $arglist and use just:

$sb={
Start-Process "C:\Temp\$process" -ArgumentList '/s' -verb runas -Wait}

So, the error has to be related to the $process = read-host ...... statement, I'm just not sure how to get it to work. Any help or ideas of an alternate means to make this work is greatly apprecieated!