The basic idea behind the Last known Good Configuration is that when Windows boots successfully, it makes note of the current configuration, marking it as good. If a catastrophic configuration change were to occur and Windows is unable to boot, then the system still has a record of a configuration that is known to be good. A boot menu option will allow you to boot Windows using this configuration and restore the known good configuration.
In case you are wondering, the Last Known Good Configuration option reverses the most recent system and driver changes within the hardware profile. The system and driver configurations are returned to the state they were in at the time of the most recent successful boot. When you boot using the Last Known Good Configuration, Windows also restores the registry settings found beneath the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet key.
Microsoft recommends using the Last Known Good Configuration option as the first technique for repairing a system that won't boot properly. However, some seasoned pros prefer to try and boot the system into Safe Mode and attempt to manually correct the problem.
I doubt that the LKGC goes back much further than a week to 10 days. Further back you need to use the restore feature to go back further to setups over 10 days old.
You probably got some trojan type software loaded to your computer from a website causing your problem. I use Avast AV software for my computers simply because it seems to work as well and any of the others and does not seem to use as much resources to run in the background. I also have spybot and run it once in a while, and i use a Hardware wireless router with firewall for my cable internet. I keep all my ports except what is needed closed in the router. I also never use Internet Explorer, and try to keep my computer as clean as possible with weekly defrags, junk file removal, and system checks at certain websites.
I would read as much as possible from this website at H-P. It should explain how to do a lot of things on your computer.http://h10025.www1.h...;product=434549
Here is how to use the recovery CD. The only problem with this is you lose all data you have put on the computer because the recovery CD takes you back to when you bought the computer brand new. http://h10025.www1.h...;product=434549
If you are not backing any data you do not want to lose at least once a month, you are just asking for a disaster. I started backing up files and systems with my first Windows 95 computer. MY Packard bell pentium 200 computer crashed and i lost many programs and files i had downloaded. I decided that would never happen again and started using floppys for saving data. When burnable CD's came out i was in heaven.
You should be able to look at your updates to see the last date there was a update( usualloy onec a week it happens to me). If you look in the windows folder in Explore you can do a properties on the folder to see when it was created. Every update installs a "Uninstaller Folder" in the windows folder. You can delete these if you feel you will not need them. I usually do so after six months or so.