Well, you have two options:
1. Try what I asked you to try
2. Try to fix it yourself.

The bottom line is:
1. Resetting MBR is a standard procedure and it can't brake anything. Your booting problem is most likely caused by an infection, which shows through redirection issue.
2. No, we didn't do anything, which would mess up your BIOS.

You did it already? In couple of minutes?
You must have some other issues then.
Hardware?
Hard drive? RAM?...or...

Well, if restoring factory image doesn't work, then I see no other possible culprit than hardware issue.

Look, I wish, I had some miracle answer to your problem, but I don't.
If fresh Windows installation doesn't work, it must be caused by some hardware issue.
Unfortunately, I don't see any other explanation.

Run hard drive diagnostics: http://www.tacktech.com/display.cfm?ttid=287 (or http://www.bleepingcomputer.com/forums/index.php?showtopic=28744&hl=hard drive diagnostic)
Make sure, you select tool, which is appropriate for the brand of your hard drive.
Depending on the program, it'll create bootable floppy, or bootable CD.
If downloaded file is of .iso type, use ImgBurn: http://www.imgburn.com/ to burn .iso file to a CD (select "Write image file to disc" option), and make the CD bootable.
For Toshiba hard drives, see here: http://sdd.toshiba.com/main.aspx?Pa...rivesUSandCanada/SoftwareUtilities#diagnostic

Note : If you do not know how to set your computer to boot from CD follow the steps here

=====================================================================

A. If you have more than one RAM module installed, try starting/running computer with one RAM stick at a time.

NOTE Keep in mind, the manual check listed above is always superior to the software check, listed below. DO NOT proceed with memtest, if you can go with option A

B. If you have only one RAM stick installed...
...run memtest...

1. Download - Pre-Compiled Bootable ISO (.zip)
2. Unzip downloaded memtest86+-....iso.zip file.
3. Inside, you'll find memtest86+-....iso file.
4. Download, and install ImgBurn: http://www.imgburn.com/
5. Insert blank CD into your CD drive.
6. Open ImgBurn, and click on Write image file to disc
7. Click on Browse for a file... icon:



8. Locate memtest86+-....iso file, and click Open button.
9. Click on ImgBurn green arrow to start burning bootable memtest86 CD:



10. Once the CD is created, boot from it, and memtest will automatically start to run.

The running program will look something like this depending on the size and number of ram modules installed:




It's recommended to run 5-6 passes. Each pass contains very same 8 tests.

This will show the progress of the test. It can take a while. Be patient, or leave it running overnight.



The following image is the test results area:



The most important item here is the “errors” line. If you see ANY errors, even one, most likely, you have bad RAM.

I fully understand your pain.
I'm really sorry we can't fix it at will, but unfortunately this is what sometimes happens with machines.
I reset MBR on number of computers, day in, day out around here and on other forums and somehow, today, I have two very similar issues. Your computer and another one on this very same forum.
Unfortunately, in both cases, I see no other explanation, but (coincidentally) as some hardware issue.
Let's put it this way.
IF...IF you have a hard drive issue, MBR will get reset successfully (software-wise), but because of the drive issue, it won't be written correctly causing not bootable machine.
I'm sorry again and, please, keep me posted.

I deleted your double post.

I'll be around