ERROR 1327 encountered after installing Acrobat 7

My PC got infected with a Trojan and other virus one day. Upon discovering that I decided to uninstall many of my programs and managed to retain the rest. Then I wanted to reinstall Adobe Reader/Acrobat 7, and in so doing I encountered an error (image below):

The error message: Error 1327.Invalid Drive E"
The confusing thing is, I don’t have a drive E on my PC. It is not partitioned.
What is causing this error? Please tell me the best way to get rid of this.
Bundle of thanks.
