I have a 2010 MacBook Pro with an i7 processor, 8 G-Byte of RAM and a 500 G-Byte hard drive with plenty of free space. Whenever I run a Windows 7 virtual machine under Parallels 7, ~ 6 G-Byte of wired memory is used. I have allocated 4 G-Byte of memory to the virtual machine. I would expect plenty of free space and that used to be the case but no longer. I am tired of an unresponsive machine and spinning beach-balls. Any ideas?