I installed openERP in Win7 but it works very slow. What can I do to speed up the software?
Compared to OERP v6.1 on the same hardware, the v7 is most definately slower. I often get errors because I click on a menu while the screen hasn't fully loaded yet. Or when typing in the searchbox, part of the text isn't captured correctly when typing. You have to type superslow for the searchbox to work.
As some others already pointed out, openERP is not too quick on Windows. When you run openERP 7 on Ubuntu, it is much more responsive, even when the Ubuntu-machine is a VM.
And it is not too difficult to install openERP on Ubuntu, there are various tutorials here and elsewhere on the internet.