Not all disabilities are obvious, so sometimes being a little circumspect can avoid embarassment.
Some of mine are physical and fairly obvious others are internal, memory etc; and are classed as hidden.

Hiya
Well the comments about my choices/decision making etc.
Well a little more progress to report.
I switched to CentOS 6.2 and it gave warnings about imcompatibilty or something, so I waited a few days.
Did an install of CentOS 6.2, and Win 7 still booted, so something was obviously wrong.
W7 showed some newly created Logical Volumes, which I wasnt hapy with.
I left it use all the current Linux allocated space, that bit for PCLos etc. and it also use all the free space as well.
So I did a reinstall with me giving the partition sizes.
I deleted the logical volume and made sda5,6 &7 as 20 gig /, 20 gig /home & 2gig swap.
The install seemed to go well and it offered a place, /dev/sda5, as the choice of bootloader space. I said YES.
WIndows 7 booted again, so....
Silly me
The "bios" has 3 choices of bootable device, in order of priority they were
Windows Boot Manager
Hitachi HDD
BluRay/DVD (which I selected for Cent OS install)
so I chose Hitachi HDD and CentOS came up as a boot choice for a few seconds and then booted by default.
So now I have to find a way to install PCLos and add it to the CentOS bootloader, and increase the time to choose to about 28 seconds.
Then I can remove CentOS and use PCLos, provided I can substitute the booter.
I will try and post the partition table later.
Success

[root@dhcppc2 johndough]# fdisk -l
WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x06dc198e
Device Boot Start End Blocks Id System
/dev/sda1 1 121602 976762583+ ee GPT
[root@dhcppc2 johndough]# parted -l
Model: ATA Hitachi HDS5C101 (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 1049kB 106MB 105MB fat32 EFI system partition boot, hidden, legacy_boot
2 106MB 240MB 134MB Microsoft reserved partition hidden, msftres, legacy_boot
3 240MB 87.9GB 87.7GB ntfs Basic data partition hidden, legacy_boot
4 87.9GB 88.5GB 524MB ext4 boot, legacy_boot
5 88.5GB 109GB 21.0GB ext4 boot
6 109GB 130GB 21.0GB ext4
7 130GB 133GB 2097MB linux-swap(v1)