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Replacement SSD slows down Windows 7 when drive accessed

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Hi, I had a 120GB SSD in my PC and it was almost full up, so I cloned the SSD to a 1TB Patriot P210 SSD. I then removed the old 120GB SSD from the PC and put the 1TB one in its place. I have an 'HP Compaq 8200 Elite Base Model Ultra-slim PC'. I have Windows 7 Ultimate 64 bit.
When I booted back into Windows for the first time, after getting to the desktop, I noticed a little bubble saying something about 'Drivers installed for Patriot P210' or words to that effect. I didn't expect this to happen, as it's just a standard SATA SSD. Then a message said something about 'to finish installing the new drivers, please reboot your PC', so I did. Then when I got back into Windows, the hard drive would often stay on solid for long periods of time, and during this time, all programs on the PC would hang and I could do nothing. I uninstalled the drivers for the hard drive using Device Manager, restarted, and then after the the message aboutu 'to finish installing the new drivers, please reboot your PC' came up, I didn't restart, I tried to copy a 20GB folder of about 1,500 files to a second partition I had made on the 1TB hard drive. This was running at 60MB/s to begin with, then it slowed down to 2MB/s and I couldn't do anything with the PC because nothing would respond, until I used CTRL-ALT-DEL to get to Task Manager, and managed to cancel the copying.

The drivers I have for the hard drive are
C:\Windows\system32\DRIVERS\disk.sys
C:\Windows\system32\drivers\partmgr.sys

I don't know why the first path has 'DRIVERS' in capital letters, it's in lower case in the system32 folder.

I have checked for any driver updates using the HP website, which installs a simple driver search software thing, and it says all my drivers are up to date.
I think it's a driver issue, but I don't know. I have another PC on which I can try to check the 1TB hard drive is okay - it's a brand new drive that I have had sitting on my desk for about two months, unused.
 
Now when I try to copy the 20GB of 1,500 files, it is running at from 5KB/s to 100KB/s - abysmally slow.
On the old 120GB SSD, everything was running fine, Firefox and Edge worked fine, copying files was fast, there was no slowdown at all, the only thing I have changed is the SSD.
The hard drive light keeps going on solid for a minute or so at a time, for no reason, while I am using Firefox and nothing else. This never used to happen with the old SSD - the hard drive light would flicker when reading or writing, but would rarely stay on solid.

The disk.sys driver is version 6.1.7600.16385 (win7_rtm.090713-1255)
 
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