This is an odd problem- it is on my Advent 4213 but I've put it in General as it may be independent of make/model.
This afternoon I tried to use the Right Click on the power icon in the tasktray to change some settings. Nothing happened- the context menu came up, but all the links except Windows Mobility centre (which worked OK) just resulted in about 30 seconds of disk activity then nothing.
So, I decided to go to Power Settings via Start/Control Panel- same result. No Control Panel page, just the disk activity light for 30 seconds then nothing else. All this time, I can open/switch programs with no trouble.
Same happens with any system link from the start menu including Printers and Networking.
I tried the 'Create Administrator Account' via the start menu Search facility, and 'Modify User Accounts' with the same result- nothing
All the while I can run and use any installed program.
I'm using Panda AV for Win7 Beta, and have tried turning it off, with no change. I can't turn Windows Firewall off as I can't access the settings.
I've tried a system restore back to one month agao when I know it was working, and again, same result.
This has completely foxed me and I'd dearly like some advice!