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Unless you are trying to connect using USB the install CD from ntl / Virgin Media is not required. If you must use USB then you only need the drivers off the CD, nothing else.
If you want to use the same modem with more than one PC, only one PC can be connected at a time, and each time you swap connections the modem must be powered off then on, with the unused PC completely disconnected.
The network connections on the PC must be set to auto detect.
If you have previously installed AOL or any other software that specifies a connection, get rid of it, and ensure it's settings have been deleted.