HDD Low

HDD Low is malicious software, do not install it. Its FAKE and does nothing but try to scam money out of you and steal your credit card details.
If you have installed it, download and run MalwareBytes Anti-Malware, this will completely remove HDD Low and return your computer to normal operation.
If you can't do anything on the computer because of HDD Low, press Ctrl Alt Del, right click on HDD Low, go to process and then End process.

Dell flashing cursor

Fault - Had a Dell Inspiron 530 in today, that would display the Dell starup screen, but then stop with a flashing cursor in the top left of the screen. Pressing F2 or F12 on startup led to the same flashing cursor.
Repair - one of the ram chips was faulty, replaced and all worked Ok again.

NDIS.SYS error blue screen of death

After uninstalling Norton 360 from an Acer laptop it started displaying a blue screen on windows XP startup with an NDIS.SYS error.
Neither System Restore or Norton Removal Tool would fix it.
The problem turned out to be the driver for the builtin Atheros wireless adapter. I managed to disable the adapter after starting up in Safe Mode (F8 on startup, then control panel, system, hardware tab, device manager) and it started up Ok.
Next, using another PC, I downloaded the latest driver, copied it over to the Acer on a memory stick, enabled the wireless adapter, updated the driver, and all was Ok again.