More Prob after upgrade to 4.12Pro

Experiencing these problems after upgrade (1) After a few hours I get error "Windows virtual memory too low" - and Limewire shuts down. I never had that before (2) Still drastically reduced search results compared to 4.6 (3) Still drastically reduced speeds compared to before, ALTHOUGH I finally got some improvement by repeatedly using the 'end connection' feature until I had all 5 Ultrapeers at 4.12 Pro (does that make a difference??). (4) Absolutely NO UPLOADS are going, when previously people were constantly uploading from me. I don't have a massive shared library, maybe 100 various files now, but there used to always be at least one person trying to get something. MY STATS: WinXP Home, Dell Dimension 8200, 80G drive (23 free), 1.2G Ram, Comcast Cable connection, McAffee Security Center with Limewire granted FULL access in/out, upgrade to latest Java 7/23/07, no brick in front of globe, I can see 'incoming searches' detail if I turn it on.