Macbook Pro 2.33Ghz 2Gb ram 120 Gb HD - Suggestions about O.S. I can install?

The complete specs of the machine:

https://everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-2-duo-2.33 -15-specs.html

I am using the Mac Os Tiger (the same that came with the machine) in dual boot with Windows XP (boot camp).

I have had a lot of problems using Tiger + Windows XP (yes, it has not support anymore).

So, I decided to install Windows 7 in my machine.

After I had searched in google I could see it was not possible to install Win 7 using Tiger. I had to upgrade to Snow Leopard ($19.99) or Lion.

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'This model shipped with Mac OS X 10.4.8 Tiger and supports OS X 10.7 Lion, but not 10.8 Mountain Lion or later.

Macintel models are the only Macs that can boot OS X from a USB hard drive. That should make a lot of Mac users happy, although it may be the beginning of the end for external drives with dual FireWire 400/USB 2.0 support.

Requires Mac OS X 10.4.8 to 10.7 Lion, not compatible with 10.8 Mountain Lion

Mac OS X 10.6 Snow Leopard compatibility

Grand Central Dispatch is supported.

64-bit operation is supported.

OpenCL is not supported with the Mobility Radeon X1600 GPU.'

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After this search (and some others) I am thinking about to:

1. Install Lion and Windows 7 (with boot camp). Inside Windows 7 I can install VMWare + linux (maybe Ubuntu).

So, I could had 3 O.S. in this machine.

2. Install Snow Leopard and Windows 7 (using boot camp).

3. Maybe install Mountain Lion (if I upgrade the RAM).

In your bigger experience, what do you suggest?

No, I do not have interest to use Mac Os. My main interest is to use WINDOWS 7. But as I can not use this Mac Book Pro to anything this time I am trying to make it to work.
My litle son will use it to play games or learn something usefull.

If it was possible to install Win 7 using Mac Os Tiger it would be great.

I can not access websites using Tiger. It is a BAD experience. Opera, Firefox, Safari.. do not work with Gmail, etc. ('your browser has an old version and it is not supported'). If I try to upgrade, it does not install new versions of browsers.

Yes, I can try to upgrade RAM if necessary. But I think Mountain Lion needs at least 4 Gb ram.

Suggestions?

Thank you!