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Hard drive upgrade

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I have installed a faster hard drive in my Sony VAIO laptop
Pentium 4, 2.8GHz
Win XP Pro, SP2

I replaced the original Hitachi 4200 RPM drive with a newer Hitachi 7200 RPM drive (Hitachi HTS726060M9AT00) after having cloned it from the original drive. The PC boots up fine, and all my applications and data are fine.

However, when booting up the system sees new hardware and attempts to install it. It recognizes the new disk drive, and states the model number listed above. Then I get a window saying "Cannot install this hardware. An error occured during the installation of this device. The specified service does not exist as an installed service." I click finish, get a couple of more messages in the right side of the taskbar about not being able to use the new hardware, and am then up and running just fine as though nothing had a problem at all.

I go into CP, System, Hardware, Device Manager and notice a yellow exclamation point in front of my new disk drive. I click Properties and under the General tab it says "The drivers for this device are not installed - Code 28." Under the Driver tab, the Driver Provider is Unknown, Date and Version not available. Under Driver File details I see "c:\WINDOWS\system32\drivers\PartMgr.sys"

I've been to the Hitachi website (amongst another 20 websites!) trying to figure it out. Hitachi does not provide drivers, saying they are embedded in the OS.

What's odd is that once I get past all the boot up, start up stuff (messages flying and errors abounding), everything works just fine! Everything looks and acts just like the original hard drive. This error stuff happens eveytime I turn on the PC.

Any thoughts? This one is way over my head. And always thanks in advance for any suggestions and kind assistance.
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I would contact the manufacturer of the Laptop and ask them for help.

Most laptops come with a pre-installed OS. I am not sure but it is possible that some of these OS's do not have all the drivers that are in a standard XP build (just a guess)
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