virtualbox.org

I have just upgraded my host to Win 7 64-bit, and now shared folder in my XP guest stopped working. Shared folders under Ubuntu guest works on the same machine! Tried uninstalling and reinstalling, but no success. It was working before, but now it says:
\\vboxsvr not available
I cannot map network drives nor browse them in the network connections.

BTW, turned off firewall totally, still the same!

OK, I solved it:
1. uninstall guest tools
2. net use driveletter: /d
3. reinstall guest tools
4. net use driveletter: \\vboxsvr\sharedfolder

Now it works!