Despite cleaning, repairing and doing everything possible to my computer, the update 10.7.2 keeps telling me my disks are not compatible, I can give you more information, please help

I have all three combo updates 10.7.2, .3 and .5. But I get the same error they just wont load. I get a message saying that mmy hard drive (the main drive) does not meet the requirements and each of my disks has a yellow triangle by them in the install window. Is it my chipset ? One of the advice pages says I should have core2due i3 or i5 or i7. Mt system is a dual processor quad-core (8 core altogether) is this not compatible with those upgrades. ?

Yesterday I backed up this main drive, repaired it, and then replaced all files from the back up and made it my boot frive again. I did a verification, and the report is clean. It meets all of the criteria above you mention, except I notice when I actually click on the drive below the drive title, there is a blank field where the other drives have something written there. The field "mount point" apart from a forward slash '/' is blank. On the other drives it says/Volumes "drivename". I can't type in there so am not sure whether that would cause a fault or not, or how to rectify it.

I also have noticed that since the update from 10.6.8 to 10.7. I get java update request on startup, it checks for software but always says no software found. I have tried to get the java runtime independently but it says I need 10.7.3... back to square one. I have a few other application that are compatible with 10.7 but when I click on them nothing happens, ITunes being one of them,

I have subsequently discovered that because of the processes above my main drive is listed on the /Volumes folder as an alias... this must be because of it's restored nature from the back up drive. Is there any way to change it;s status from an alias to it's proper status ? Will this solve the problem

Than ks baltwo did that , no problem with 10.6.78, no problems with 10.7, but no further upgrades work, justkeep getting same error, disk/s does not meet the requirement. Just cannot fathom it out.