4G RAM Win732bit

[pstyle]

OK, here's the question, (for those who cannot be bothered reading the whole post):
Will an upgrade to Win7 64bit solve this big-map joining problem, or is more RAM required? OR is BOTH required (upgrade RAM AND windows)?

Backstory:
One of my squad mates has 4Gb RAM, and Win7 32bit.
He is able to join multiplayer servers, but only when the maps are "small". He is unable to join multiplayer servers running the channel map. Trying to connect to a server running the large map results in a launcher crash during map load.

He can run the game and join servers on quite high graphics settings (so GPU is not an issue).
The new patch and HOTFIX are both installed.
We have read through the forums and tired some of the suggested fixes such as:
1. Turning SSAO on/off
2. Combinations of turning shadows and grass on/off
3. Messing about with the full-screen options
4. None of the above have worked.

Now, from my reading, it seems that there are some (maybe quite a few) people who can load the large-map servers with 4Gb RAM.

So, the question again, Will an upgrade to Win7 64bit solve this big-map joining problem, or is more RAM required? OR is BOTH required (upgrade RAM AND windows)?

Obviously, the cheaper option is just to got for a windows upgrade first….
Any help would be appreciated.