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If there is no important data, I would do fresh installation that should help to resolve the issue. Or check the manual of system see if you can run recovery from receovery partition built-in system (during start up fress F10). <br />
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Have you recently installed new hardware? 
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If there is no important data, I would do fresh installation that should help to resolve the issue. Or check the manual of system see if you can run recovery from receovery partition built-in system (during start up fress F10).

Have you recently installed new hardware?

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I recently upgraded the ram from 256 mb to 512 mb. Could this be the issue?? I installed the memory recommended by HP
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I recently upgraded the ram from 256 mb to 512 mb. Could this be the issue?? I installed the memory recommended by HP

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Try running chkdsk &nbsp;if you are unable to see the bsod try booting up into safe mode if possible.
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Try running chkdsk  if you are unable to see the bsod try booting up into safe mode if possible.

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I have an old HP Pavillion 6746 pc with Windows XP home on it. It has 512 MB ram in it. It was working slow but okay the other day. Now when I start it up, it constantly reboots no matter if I select safe mode or last known good configuration or any of the other selections. Any ideas how I might be able to get to the desktop would be appreciated.<br />
<br />
thanks
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I have an old HP Pavillion 6746 pc with Windows XP home on it. It has 512 MB ram in it. It was working slow but okay the other day. Now when I start it up, it constantly reboots no matter if I select safe mode or last known good configuration or any of the other selections. Any ideas how I might be able to get to the desktop would be appreciated.

thanks

xp continuous reboot

Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. For large systems, the operating system makes sure that different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system. Operating systems provide a software platform on top of which other programs, called application programs, can run.

Operating Systems

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.

Windows XP

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.