wireless networking - Internet connection sharing over WIFI without modifying LAN adapter IP address

I have an Android phone (non-rooted Sony Ericsson ST15i) that I'd like to connect to the internet via my laptop's wired Ethernet connection (linked to my university network, that uses an authentication proxy to connect to the internet, with a fixed IP address assigned to every dorm room). This wired connection shows up on my system as the default "Local Area Connection".

I tried a few things for this:

Virtual Router Manager - in order to get the Android phone to recognise the laptop as a WiFi hotspot, since it can't connect to ad-hoc networks. But the application fails to connect giving me the error "Virtual Router could not be started".

Internet connection sharing in Windows 7 - tried setting the "Wireless Network Connection" to share the internet connection from "Local Area Connection", but this gave me a popup saying that the LAN adapter will be set to the IP address 192.168.137.1 - which is different from the IP address assigned to my room.

Is there a way to make this work?

Thanks in advance!

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