Is it possible to install Windows 7 build 7000 on a hard disk with two partitions and one has Vista. I want to try Windows 7 but I don't want to lose my Vista partition.
Windows 7 Beta build 7000 is avail. for download at Microsoft until 24 January 2009

thanks in advance

Sure it would be very easy to do in using the free boot manager GAG...download it and install it and then install W7 on any free partition.

If your computer uses a SATA drive then you may have problems locating a driver for the SATA controller ( I think that W7 has most controller drivers ) Try to install it first and go from there

Yes, Windows 7 has a boot manager built in.
I put in on as dual boot with XP home. Working well so far.
Here's a little help if you need it.
Windows 7: How to Dual Boot Windows 7 with XP or Vista