This is really wierd but after installing VM additions on my VPC2007, the mouse cursor just disappears when it hovers over a text field and this is really annoying!
The only reference that I found was this discussion. That guy called Paul Adare suggested to change the mouse pointers color scheme to black.. and guess what, it works!
In fact, changing it to anything else but the 'Windows standart' scheme will do the job.
Great tip, thanks.