Desktop keeps rebooting

I am working on an old Dell Dimension desktop 2350. It keeps rebooting just after the Windows XP screen, doesn't let me go into the safe mode either. I tried to 'repair' the hard drive from the XP disc, it still kept doing the same thing. Would a BIOS upgrade solve the problem and if so, how would I be able to do this from a flash drive or do I have to do it from the Floppy drive?
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More about desktop rebooting
  1. You may have a ram issue, but more likely, an important device driver is missing from windows. A fresh installation might help. First, try each stick of ram one at a time. Bios updates won't help.
  2. What did you change? A/K/A - what caused the problem. If it worked before then this 'suddenly' cropped-up then it's not the BIOS; sure Load Defaults to see if that helps.

    Right now I'm interested in changes before speculating bad components.
  3. I scanned it by attaching via an adapter, it showed me virus but did not let me quarantine or remove them. So I installed new version of OS on the same partition but different folder (C:\Windows2 instead of C:\Windows)> Would I be able to retrieve data, if there were any, from that partition?
  4. Try getting into the old partition; I use microsoft security essentials, a free download. Uninstall any other virus software before trying it. It works well for me. To use it with xp, you'll need to install windows service pack 3 first.
  5. ^ Use ESET Free online scanner -> http://www.eset.com/online-scanner

    Yes, you can easily pull data from a partition. Depending upon the virus {some screw with the .exe} you 'might' be able to run System Restore. I rarely post registry issues, but I know my way around it.

    If it screwed with the .exe then DO NOT run System Restore; here's a .exe registry fix -> http://www.symantec.com/connect/blogs/xp-internet-security-2010-rogue

    Fix .exe

    1. Ctrl-Alt-Del, kill {av.exe}; or whatever BAD App

    2. Run {rstrui.exe} RegEdit and correct the following:
    [BAD]
    HKEY_CURRENT_USER\Software\Classes\.exe\shell\open\command "(Default)" = "%UserProfile%\Local Settings\Application Data\av.exe" /START "%1" %*
    [Good]
    HKEY_CURRENT_USER\Software\Classes\.exe\shell\open\command
    (Default) REG_SZ exefile
    Content Type REG_SZ application/x-msdownload

    [BAD]
    HKEY_CURRENT_USER\Software\Classes\secfile\shell\open\command "(Default)" = "%UserProfile%\Local Settings\Application Data\av.exe" /START "%1" %*
    [Good]
    *Delete Key*

    [BAD]
    HKEY_CLASSES_ROOT\.exe\shell\open\command "(Default)" = "%UserProfile%\Local Settings\Application Data\av.exe" /START "%1" %*
    [Good]
    HKEY_CLASSES_ROOT\.exe\shell\open\command
    (Default) REG_SZ exefile
    Content Type REG_SZ application/x-msdownload
    + Folder = HKEY_CLASSES_ROOT\.exe\PersistentHandler
    [correct key entry should be unaffected]
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