Reinstall of Win7 Clock losing time

I am adding to this and changed the title, I hope thats ok,rather than start a new thread.
More details: a few months ago my computer started shutting down, it became worse over time, and I saw SMART messages saying the hard drive was dying, chkdsk showed some corrupted areas, so we put in a new hard drive, and reinstalled a bought copy of windows 7,I had tried to reinstall an image backup, but I didnt know how to properly, so went for the easier option. It is still shutting down and also the clock will not keep time, I have tried all and everything including reinstalling the old system image, reinstalling windows 7 a few times, and everything it says below. Today its only shut down 1 time and so I thought id post here while I can.
When it does restart I do system repair, sometimes it works sometimes not, once it starts a shut down cycle, it has even shut during reinstalling or repairing which isnt fun.
Ive been battling this for over a month now, I'm thinking maybe the motherboard is dying? weve taken out the cmos battery twice, tried an older video card, taken out the ram and reinserted it,reset the cmos.
Its very hard to fix something when you dont actually know whats wrong! if its software or hardware lol,and it almost seems like the more we do to fix it, the worse it gets!
At the moment Im unplugging the BT hub, start up the computer, after 5 min i plug the internet back in, which seems to help. all windows updates are done 6 at a time, most successful except when it crashed whilst installing some. There are no software programs in, like office etc,its just windows 7 home, we might play spider solitaire if we are lucky.
It did have all Dell software in, but not now, its just windows 7 on a 2 TB hdd.
Im sorry for the wall of text.

Hi everyone, Im very new here, apologies if I am unclear sometimes, Im an old fogey! So, I've got an Alienware Aurora R4, over time, we've updated the graphics card, the cooler and added memory, info is on my profile [I think?] The Hard Drive was dying, so a few weeks ago we put in a new hard drive, using an external HDD to reinstall the image and windows etc, which didnt go well, so we bought a windows 7 dvd, and started from scratch, installed that, and various drivers/updates & folders from the HDD, all seemed to be well, so we started installing software, Ive not got much, AVG, Microsoft office, itunes, photoshop elements.
The main problem I'm having is that the clock will not keep time, When I start up it shows the time I last shut down. if I reset the time, it loses minutes here and there until its at least an hour behind.
I have tried everything that Ive read on the internet, with no luck, I've checked the Bios and it has been wrong in there so we've replaced the CMOS battery, Ive corrected the time in there a few times.
Ive looked at services, and changed windows time to automatic/manual etc, restarted it etc, no luck there, Ive R-click the clock and tried various 'time.windows.com' options to reset it, but it starts losing almost immediately until its over an hour slow.
I've tried sfc scannow in a command prompt, to check files, that said 'no integrity violations'.
I have looked in the registry, at /system/current control set/services/w32time/time providers/ it should have ntp client here I believe, but theres only an ab icon and some info in the right pane: [default] Reg.sz [data not set]
I'm fearing that I will have to alter things in the registry, or the bios may need updating? Again I apologise if this is rather confusing info.Any help will be much appreciated.

Hi Raggy, welcome to the Forum.

It seems that you have checked most thinks but have you set your location correctly. This is very important for time setting & keeping.

Hi Raggy,

Here is a brief outline of Repair Install if you decide to go down this route!

Repair Install - Overview

A repair install differs from a clean install in the fact that it ONLY replaces the corrupted OS with a new fresh copy. This means that ALL your User Accounts, Folders, Files, Documents, Pictures, Music, Videos, Data Files, Icons, and any installed programs are left intact. It does however, delete ALL the Window updates, and can affect, sounds, services, visual effect settings and device drivers by re-setting them to default. You cannot do a repair install at boot, in Safe Mode, using a system repair disk, or using an integrated Windows update disk. Basically, this process can ONLY be performed from within the LIVE OS.

You can then either use DISM++ or SIMPLIX to get the WU's [Windows Updates] current.

I hope this helps!

Raggy said:

Thank you for your efforts, I tried the reg time edits, but they would not install, when I dbl clicked each of them, it said cannot install error accessing the registry.
I'm pretty sure that something is missing when I installed windows 7. to add to my info, it did used to have Alienware programs like command centre and respawn but they are gone now Ive done what I thought/hoped was a clean install of win7 on a new hard drive. I really am unsure what to do next, maybe use the installation disk to try a repair. I wish I'd read this forum more before doing anything, but the hard drive was corrupted and dying, so I had to quickly do a windows backup, and recovery disk, but ended up just using a new windows dvd.

If you have not found the Fix to your Time. I did a quick Google on your problem and ran across this.
Why does my computer clock keep losing time? [Fixed] - The actual article is not much help but at the bottom of the page, in the Comments by Michael Alexander, it appears he has found a solution.

Here's more detail and links Repair Install Instructions.docx