There is some further info on these here..
Retrospect Western Digital Service. Program installed by the installation CD for Western Digital external USB Hard Drives. Typically, the Western Digital USB drives come bundled with the Dantz Retrospect backup program for the user to use with the drive. This service enables the Dantz Retrospect backup software to backup to the drive and restore from it.
wdsvc stand for Western Digital service. It's a driver for WD Dual-option external USB hard drive
As DDL56, this is wrong. The original poster asked for information about WLIDSVC.EXE and WLIDSVCM.EXE, NOT Wdsvc.exe.
WLIDSVC.EXE and WLIDSVCM.EXE are the Windows Live ID Service and Windows Live ID Service Monitor, respectively. They usually get installed when you install one or more Windows Live Clients (e.g. Windows Live Photo Gallery). When you log into your Windows Live account, these services cache your userid/password information for use in logging into other Windows Live clients and online services.
That's part of the theory, at any rate. In practice, sometimes they work as advertised, sometimes they don't. I've found that my userid and password are cached for use when I run different Windows Live clients; but if I click on "Help and Support" in any of these clients to access the online help and/or forums, I have to log into my Windows Live account again. It doesn't matter if I'm running IE or Firefox as my default browser.
Given this fact, I tried uninstalling the two services. They weren't listed in Control Panel | Programs and Features as installed programs, but I was able to use the free Revo Uninstaller to uninstall the two services while retaining all other Windows Live components.
It didn't make any difference. The next time I ran Windows Live Photo Gallery, the services were re-installed and launched. So it appears that I'm stuck with them, even though they do nothing to support logging into Windows Live online services.
OS: Windows 7 Home Premium
Windows Live Essentials, platform support, etc: 15.4.3502.922
Windows Live Photo Gallery: 15.4.3502.922
Windows Live Movie Maker: 15.4.3502.922
Other Windows Live Clients: Not installed
Windows Live ID Service: 7.250.4225.0
Windows Live ID Service Monitor: 7.250.4225.0
Microsoft Office: Not installed
Internet Explorer: 8.0.7600.16385
Mozilla Firefox: 3.6.10
Hope this information is useful to anyone else wondering about these Live ID services. Note that I've chosen not to install Microsoft Office or any Windows Live ID clients other than Movie Maker and Photo Gallery. This might have some bearing on why the ID services don't cache my login info for online use.
Have a good one,
Big Al Mintaka
Edited by AlanMintaka, 04 October 2010 - 11:46 AM.