Also, what I find really handy, is to create 2 shortcuts in my Send To folder so that I can right-click on any *.exe and pack/unpack the file as required
How to
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Copy the main UPX.exe to C:\
Go into C:\Documents and Settings\Owner\SendTo
This folder is usually hidden
Create a new shortcut
In the text field enter C:\upx.exe -9 -q --no-progress %s
Save the shortcut as UPX - Compress
Create another new shortcut
In the text field enter C:\upx.exe -d -no-progress %s
Save the shortcut as UPX - De-Compress
How to
=========
Copy the main UPX.exe to C:\
Go into C:\Documents and Settings\Owner\SendTo
This folder is usually hidden
Create a new shortcut
In the text field enter C:\upx.exe -9 -q --no-progress %s
Save the shortcut as UPX - Compress
Create another new shortcut
In the text field enter C:\upx.exe -d -no-progress %s
Save the shortcut as UPX - De-Compress