Boots on, boots off;
Why is everyone having boot mgr problems?
To be real there is no one answer to this never ending question.
It is caused by many reasons but experience shows it usually points to a hardware install that went pearshaped, (soundcard, graphics card etc). Failure to reboot on install BEFORE configuration of these in some cases, games, game controllers, the list is end less.
It is seen in XP, Vista and 7 (to a lesser degree).
Troubleshooting without the OS repair disk then becomes a problem and you might be looking at a complete reinstal (my preference anyway after 30 mins of messing).
In many cases it is the LACK of back up, folders, files (docs, images, music etc) because ALL your important files are on the C drive and never moved where the nightmare starts.
So we see simple housekeeping is not observed in many cases.
Nowadays, we should be imaging as a standard procedure, have bacup disks of our 'stuff' and the main OS.
The windows option is pretty useless if not criminal.
Fortunately there is software to help. One I, and many here on HTG use all the time is http://www.macrium.com/reflectfree.aspx
To recap, get your system running as you want it to. Ensure your apps are installed. Update your OS. Now image, ensure all your data is on an external drive (or partition).
A very good tut here for further info regarding this... http://www.howtogeek.com/forum.....replies=39
And of course, this is not the resolve in all cases, but it should point peeps in the right direction hopefully.