I realize this is an old post but I have the answer. After doing a scan using Microsoft Security Essentials and restarting my PC I was stuck with the loop that Windows did not shut down properly and was given several choices such as starting with safe mode , safe mode w/ networking etc. Nothing worked but I was able to go into recovery by pressing f10 so I did a non destructive recovery then I ended up with the NTLDR is compressed press CTRL+ALT+DEL which was also a loop. What has happened is that my computer was set to compress to save space so when I did the recovery it came up with the error. I found the answer here (copy and paste in address bar) http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=e... . To start the process press the CTRL+ALT+DEL and hit f10 , you have to do it fast, it may take a couple of tries but you should be able to get into the recovery mode. I did not have the recovery Cd's so the steps I used are at the bottom listed as alternative steps. Be sure to follow exactly as described. After its all done you will probably go through a registration process but your stuff should still be there. I also had to reinstall service pack 2 after doing a setup for updates. Be sure to do this as you may not be able to do certain things and it is also there for security purposes. I had to do this also to reinstall Microsoft Security Essentials. Microsoft is now giving us free anti spy ware so its best to get it on your PC ASAP. After all this is why I got into the mess in the first place because of some virus and bad ware on my PC. Your PC is not safe without it, especially if you like to surf the net. Good luck!!