Check Windows expiration date

Start -> Run -> winver and hit enter :-)

Upgrade pre-RC (70xx) to RC (71xx)

use the following trick to to upgrade successfully from pre-RC (build
70xx series) to RC (possibly 71xx series).

1.Download the Windows 7 ISO.
2.Burn the Windows 7 ISO image to a DVD, and then copy and whole image
to a storage location that you wish to run the upgrade from (can be
either any directory/folder on any partition/drive on the machine
running the pre-release build, or a bootable USB/FireWire flash
drive).
Alternatively, it’s possible to directly extract the content of the
ISO to a desired folder using file extraction tool such as WinRAR.

3.Browse to the sources directory.
4.Open the file cversion.ini in a text editor such as Notepad.
5.Modify the MinClient build number to a value lower than the
down-level build. For example, change 7100 to 7000.


6.Save the file in original place and original name.
7.Start the setup process of Windows 7 as per normal from the modified
copy of the installation files, and the version check will be
bypassed

Free Windows 7 RC Activation Product Keys

Free Windows 7 RC Activation Product Keys
MM7DF-G8XWM-J2VRG-4M3C4-GR27X
KGMPT-GQ6XF-DM3VM-HW6PR-DX9G8
MVBCQ-B3VPW-CT369-VM9TB-YFGBP
KBHBX-GP9P3-KH4H4-HKJP4-9VYKQ
BCGX7-P3XWP-PPPCV-Q2H7C-FCGFR
RGQ3V-MCMTC-6HP8R-98CDK-VP3FM
Q3VMJ-TMJ3M-99RF9-CVPJ3-Q7VF3
6JQ32-Y9CGY-3Y986-HDQKT-BPFPG
P72QK-2Y3B8-YDHDV-29DQB-QKWWM
6F4BB-YCB3T-WK763-3P6YJ-BVH24
9JBBV-7Q7P7-CTDB7-KYBKG-X8HHC
C43GM-DWWV8-V6MGY-G834Y-Y8QH3
GPRG6-H3WBB-WJK6G-XX2C7-QGWQ9
MT39G-9HYXX-J3V3Q-RPXJB-RQ6D7
MVYTY-QP8R7-6G6WG-87MGT-CRH2P

The product keys can be used to activate both 32bit and 64bit Windows 7 RC