What I suggest you do is post you're question in the Q & A section but give a lot more detail like what version of Windows you are using, the total installed memory, the full system configeration and any specalised applications that you really need and someone here will solve you're problem for you but if you have followed M$ advice the correct answer is a total relaod from a blank HDD as M$ tend to stuf things up and always seem to blame it on some AV product even if none is installed.
The best one that I've ever had with M$ was an error message telling me that Device 6 wasn't present. After much looking at their material and a lot of time wasted on their knolledge base I rang them up and asked exactly what was device 6?
Eventually I was told that there was no CPU in the computer that I was trying to install Windows on and no matter how much I argued with thenm that this was not possible they just insisted that Device 6 was the CPU but I'm dammed if I know how a computer can tell you that there is no CPU installed or for that case even turn on and perform basic DOS comands like running FDISK or formating a HDD all of which had been done and it was only when I attempted to install Windows 9X that I got the error message.
