Hello Guys,
I too faced the same problem, after reading manly help pages from the net.. I thought I need to reinstall my OS.. but it got solved easily.. Wat I did is
1. Log on to "SAFE MODE WITH COMMAND PROMPT"
2. Leave the "Windows is starting Up..." screen for 5 or 10 mins
3. In that a new command prompt window will pop up
4. If you know the commands to modify the services you can type there or
5. Close that cmd.exe window and press CTRL + ALT + DEL
6. You'll get Windows Task Manager.
7. Goto File--> New Task and in the dialog box type msconfig
8. Goto the Services tab and check the services which you modified earlier or do the necessary corrections. Then Apply and Ok.
9. Restart your machine the problem will not happen again.
If it doesn't work, type "chkdsk" in step 3, in the cmd.exe.(Optional)
Actually I removed 2,3 services to make machine work faster. then I put them back and it worked much fine.
Good luck
reachSDK