SueTDI have just scanned through all of your thread. from when you started with my colleague
mailprog.
In my opinion the apparent errors we have now discovered on the HDD are perfectly illustrated, in earlier parts of the thread when the computer would NOT run certain programs sent to you by
mailprog in his process through the original aspect of the Malware matters. Not only would some programs not run, but the computer frequently blue screened or simply crashed.
To move forward -
There is NO way to be certain NOW if the heavy build up of dust particularly on the CPU cooling fins, has caused damage by overheating. Indeed, built in to the motherboard on computers are protection devices to initiate a shut-down if temperatures are detected, above a safety limit. Unfortunately these basic measures may sometimes be a little like the comparison of an oil-warning light illuminating on your car- it is frequently too late - the damage has been done.
HOPEFULLY you will have got away without serious damage.
My recommendations now are:1. Check carefully that you have NOT disturbed the connections to that drive. It is SATA, so you, most likely have two thin narrow cables. They may very well be red coloured. ONE will go from the motherboard to the drive, that is the data cable and the other will be from the PSU to the drive - that is the power cable. Check both but the favourite is the DATA cable. If that is not properly inserted in the drive and the motherboard, this MAY be the cause of the Seatools error report.
Please note this is unlikely - BUT worth a check.
Here is an image - again posted with acknowledgement to
Troy and
Artellos - that will help you. The cables on this image are yellow.
It is unlikely yours will be neatly secured like the image and it is only for your general assitance.
If you are UNSURE which is the Hard Drive - go back to your manual - on the link I sent you.

2. If after inspection you have ANY doubt that they were secure, then re-run the drive test.
DO NOT re-run that test if you are entirely satisfied that the cable was secure, both at the motherboard and the drive.
If that drive is failing, as all the evidence suggests, another extended test could well cause MORE failure.
3. Any attempt to progress further WITH that drive is pointless. ALL you are likely to suceed in doing is to ruin your chances of accessing the data.
4. A replacement HDD of that specification ie: 80Gb is readly obtainable at relatively cheap prices. I do not know what your access, where you live, is to items of this nature.
Here where I am, one of the local computer repair shops, would more or less give you one that is in a computer he has taken in and establsihed that the motherboard was instance was faulty and the specification of the computer was unworthy of repair.
However you go about it, you need to obtain a known good hard drive - it is SATA connections. DO NOT SPEND more than you absolutely have to - as the TEST is having obtained the drive to load a free operating system - perhaps UBUNTU. If that runs perfectly you may then be assured that your motherboard, processor, graphics and ram are OK.
If Ubuntu will NOT install on that drive and RUN then expenditure on YOUR desired replacement drive is pointless.
6. If Ubuntu performs perfectly, on this cheap HDD you have obtained, you then buy the replacement drive. Possibly a 250Gb - average price in the UK - £40
You then use your Dell Cd`s to reinstall your operating system.
Once you have that installed and updated you can then connect THE DRIVE now in the computer - either externally in an enclosure or docking station and attempt to access that drive from the Computer with the NEW drive on which you have installed, Windows, from your Cd`s.
7. You can then, providing it is possible to access the drive - COPY from the external to the NEW hard drive your Picures - documents - music etc.
All your programs such as for instance any Microsoft Office programs, and all non Microsoft programs - NOT included in the CD`s will be lost UNLESS you have the installation media.
8. If the DRIVE was good there is a way, using Seagate Disk Wizard, not the same as you used for the disk check, to CLONE the existing hard drive to the NEW one. HOWEVER it will more than likely fail due to the corruption of the files on the drive caused by the bad sectors.
There is a wealth of information here. If you have any questions please do not hesitate to ASKFor instance when you are ready I will provide the link and guidance to Ubuntu - the details of enclosures and docking station etc.
YOUR FIRST tasks are
1. Check the connections etc.
2. Obtain this CHEAP as possible drive to test the system with the FREE Ubunta installation.