OK, to remind you this is an ACER 5420 Laptop runnking with AMD Turion 64x2 CPU. It was originally purchased with XP installed, and I gather it was running at that time with a 32-bit OS. Since you've advised me to do a clean install, I formatted the entire disk NTFS and I've tried installing my licensed Windows7 64-bit OS.
The installatoin gets partway through and then tries to reboot on its own. It fails to do a reboot either if I leave the Wn7 install disk in the CD drive, or if I remove it. The Install screen does show Windows 7 OS is on the drive.
I tried the Repair startup options (surprising I'd have to do that on a clean install!) and it just brought me nowhere. I've obtained all the 32bit and 64bit Drivers
from ACER for this model and I have them at this point on a drive on one of my other pc's. These drivers are all supplied in zipped form, so I have created a DVD that has (separately for 32bit and for 64 bit) the Unzipped drivers that are essential (there's one for the AMD CPU by the way). I then tried the Load Drivers option in the Windows 7 install repair stage, pointed it to some of the driver
files, e.g the one for the display or mouse) and it returns with a message saying the "drivers are unsigned".
Why isn't the Windows 7 64bit install supplying the drivers it needs automatically? Should I abandon the attempt to install 64bit on this PC and go to the 32bit Windows 7 install disk that came with my Windows 7 pkg? If so, that's a disappointment because the CPU is listed as 64bit.