Does your work employ any system admins? An IT department?
They know how to fix this and recover your data. If the computer belongs to your employer and you do not tell the IT dept, it becomes your responsibility for the lost data. As BOFH and ops manager of a regional tech company, I had people waaay up the food chain fired, demoted or billed for the repair over this sort of thing.
Ya might want to CYA.
On the other hand, no IT dept with a clue would own an emachine.
So. This must be your own small business?
You data is still safe if you stop now and don't try any more "fixes".
Emachines is now owned by gateway and you should be able to order a recovery disk set from them for around 20.00
If you want help locating that, post the model, serial or service tag number here and we will point ya to it.
Buy a new hard drive. Install from the recovery cd/dvd.
Get an external enclosure for your drive. Plug it into the rebuilt machine after you have installed an up to date Antivirus and malware scanners. Set each to scan removable drives when they are plugged in.
Plug in the old drive, clean up the infections, grab your Quickbooks database files and your Documents and music.
Go on with your life.
Use the external drive as a backup device. You have no business using quickbooks without backups in two places. Even the enterprise version will occasionally stop working for no discernible reason.
If you really can't get into the bios, yer mainboard is toast.
For reference how to get into the bios for nearly all brands:http://michaelstevenstech.com/bios_manufacturer.htm
Emachines is DEL or F2
If you have an IT department, turn it in to them and play dumb.
Do NOT tell them you tried to fix it. Stick to this story.
They will give you another one and recover your files.