Posted 16 September 2011 - 04:10 PM
Recently, I installed Foxit Reader, then decided I didn't like it. When I attempted to re-install, I received the error message that "the windows installer service could not be accessed." It was listed as running in the services applet of administrator tools, but would not work.
While then exploring the system, I found other things that wouldn't work--for example, audio, which is what put me on to the same problem last May--and others. I got many "class not registered" errors. SFC won't run. When booting to the CD and running SFC, I got the old message about a pending repair, although I can find no trace of one. Ran malware scanners, of course, and the system came clean. Defragged, did scandisk. Clean boot was not useful. Trying to do a repair in place results in the error message that setup can't find any information about the discs on the system.
The most significant thing I have found, which is probably at the root of this, is that in task manager, there are no instances of svchost running, unlike the usual ten or fifteen that normally run. In the services list, some services say they are running, but aren't. Windows audio is an example.
I had this problem in May, and ended up doing a complete re-install of Windows 7 Home Premium. I would like to avoid going through that again. It's difficult with visual impairment.