2gb.
2gb.... Then you'll have total of 4gb ram but It'll still use only 3gb on 32bit os . If you want to use all you have to go for a 64bit os.
is a 32 bit OS, you should go with 2GB of ram. If you can manage 64bit XP, then you can go with 4 GB ram.OS: Windows XP Pro SP3 (Kernel Version 5.1.2600.5512)
If you can manage 64bit XP
well you can try win7 64bit also.
@op
go with win 7 64X and go with 4GB RAM.