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All your data is probably OK. The best way to access it is to remove the disk and put it into another computer. You should then be able to find the data on the disk, although it will have a different drive letter. Next time make sure your keep back-ups of all your important data.
It appears that your Windows Registry is corrupted. You can try to use a Registry repair utility like CCleane to fix it. If that doesn't work you will have to reload Windows OS (Operating System). For more info no this error code Google "c000021a".
You most likely have a hardware issue. Very possibly memory. You'll need to troubleshoot that by disconnecting everything in the case but the video, CPU, and memory and see if it starts OK. Then hook up the hard drive and see if you can boot into Windows. If you can't, unplug one of the memory sticks and try it. Then the other memory stick and try. If you have a Windows startup (installation disk), boot from that and opt for system repair. You will want to get to the command prompt and run chkdsk. See my tip here: http://www.fixya.com/support/r4501608-when_windows_xp_start_primary_fix
burn this disk as an .iso and boot from disk. try the recovery options on this disk first, and if nothing then you may be in need of a free OS install. you MUST keep all virus, spyware, and firewall up to date n order to keep your computer safe. free-avg.com does have a great free download.