SideBySide error but also strange bahviour by the PC

Hi guys.

The computer I'm talking about runs Win7 x64 Home Premium. About 2 months ago both Mobo and HDD were replaced in 2 different occasions. At first it seemed the Mobo had gone so I replaced it and re installed Win 7 on it. After few weeks it was still playing up so I replaced HDD as well. Now just before Christmas my client rang me again saying that it has been behaving very strangely. Sometimes comes up with "Please select proper boot device", sometimes crashing while in Windows.
Last night while I was troubleshooting it I found that it has loads of SideBySide errors listed. The Error code is 33 and message is:
Activation context generation failed for "C:\Program Files (x86)\IncrediMail\Bin\MFC80U.DLL". Dependent Assembly Microsoft.VC80.MFCLOC,processorArchitecture="x86",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="8.0.50608.0" could not be found. Please use sxstrace.exe for detailed diagnosis.

It mentions IncrediMail but it cannot be the reason why it also acts like this:
Last night I left it scanning for any errors on files through "sfc /scannow" It came up clean. I left the PC running and after some time it crashed. The computer restarted on its own and got stuck on the black screen saying "Insert Boot media" - just like there is no hard drive in it.
I pressed the reset button and it started up nicely.
Couple of other errors what keep reappearing in the Event Log:
Under System:
Event ID 7026: The following boot-start or system-start driver(s) failed to load: cdrom
Event ID 11: The Driver detected a controller error on \Device\IDE\IDEPort1     -      Source "atapi". This error message only happens maybe once a day.

I have disconnected the DVD-ROM it had attached (an IDE device) but Event 7026 still happens.
About 30 minutes ago I changed the SATA HDD to another slot on the motherboard - no Event 11 yet but as I said it only happens once a day or so.

Any help would be very welcome as I'm really struggling with it.
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Not much left except to replace the SATA cable.

There is an outside chance it could be the power supply but I doubt it since after a power problem it usually does not automatically reboot.
kirretAuthor Commented:
Thanks for your input.
Would a faulty SATA cable trigger the computer to shut down and then restart?
If the cable was causing random I/O errors, that could make the PC crash and it would try to reboot from that I/O error.  A bad cable could also make the boot device appear inaccessible as well as cause the controller errors you are seeing in the log file.

Worth a try, I think.

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kirretAuthor Commented:
Alrite, I'll change it over and will report back in 24h or so. Anything I should do about the SideBySide Error?
To each their own, but my policy with things like that is that it was probably always spitting out that message and no one noticed before, so the "if it ain't broke, don't fix it" rule applies.  If and when the client complains that their IncrediMail isn't working, then deal with it.

I am pretty sure the two problems are unrelated.
kirretAuthor Commented:
She did mention it before I picked it up that IncrediMail wasn't opening sometimes either. I guess I'll see if after changing the SATA cable that SidebySide thing keeps popping up.
kirretAuthor Commented:
Sorted. PC has been running for 72 hours without crashing after I changed the SATA cable.
Event log still comes up with Event ID 7026: The following boot-start or system-start driver(s) failed to load: cdrom but it's nothing crazy so will leave that.
Also SideBySide error comes up loads of times whenever IncrediMail is open so will replace it with another email client.

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