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New in 0.9.0 is the Windows 64-bit version of the client. There have been
frequent reports of users running out of virtual memory on 32-bit systems
during the initial sync. Because of this it is recommended to install the
64-bit version if your system supports it.
if you're on 32bit windows, well, 3GB of RAM should be plenty for 32-bit bitcoin-qt. are you using a high dbcache value?.... also, you can stop the sync and restart it after x blocks, and it'll clear up some RAM
I don't know how to use high dbcache value, may I use previous version bitcoid core on my Windows XP 32bit system? I want not upgrade my system to Windows 7, is there a other way to use bitcoin on my computer?
Thank you.