In windows 7 microsoft lifecam vx-700 can't get pic like winxp which 3rd party software can use

It is located in here:
http://www.microsoft.com/hardware/en-us/d/lifecam-vx-7000

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Please be sure that the VX-700 does not require a driver software as it installs by its own. So remove all previous conflicting softwares of webcams and then connect the VX 700 to be detected as a new hardware and installed.
please check to clarify from link below:

http://www.microsoft.com/windows/compatibility/windows-7/en-us/Details.aspx?type=Hardware&p=Microsoft%20LifeCam%20VX-700%20Webcam&v=Microsoft&uid=CEA-00001&l=en-US&pf=5&pi=1&c=Cameras%20%26%20Photo&sc=Webcams&os=32-bit

try to instal SP3 for winXP and the try to instal the drivers again.

Visit the Microsoft hardware support page
http://www.microsoft.com/hardware/download/download.aspx?category=ICE&type=LifeCam&sku=68A-00001
Fill in the details and click 'GO'
Click on the link:-
"Microsoft LifeCam Readme and Troubleshooting Information"
All the information you require should be found here, Including the latest software to download and Customer Support
Check out any additional software you have to download if you are running Vista or Windows 7

Procedure
Close all programs while uninstalling - downloading and uploading software
Disconnect your webcam
Uninstall the current webcam software on your computer
Restart computer
Download the Installation package from Microsoft
Run the installer and choose your options when prompted
Connect your webcam when prompted.

the following links are the software and driver for lifecam vx-1000

for XP ,Vista and WIndows 7 , 32 and 64 bit systems
http://download.microsoft.com/download/C/B/8/CB8414CD-487E-4E18-8B24-DA8ED722C770/LifeCam3.22.exe

you can get the lifecams software and driver here

http://download.microsoft.com/download/C/B/8/CB8414CD-487E-4E18-8B24-DA8ED722C770/LifeCam3.22.exe

for Windows XP, Windows Vista, Windows 7

http://www.microsoft.com/hardware/download/DownloadResult.aspx?category=ICE&type=LifeCam&name=64L-00003&os=Win7_3264&lang=en

The above link is for windows 7 and the lifecam vx-1000.
Other operating systems can be downloaded but you didn't say which op. system you have.

check the configuration of your cam, and be sure that you stalled properly the driver and software

check microsoft for known conflicts

http://support.microsoft.com/kb/953692

general issues

http://support.microsoft.com/search/default.aspx?query=lifecam+vx-7000&catalog=LCID%3D1033&mode=r