|Is it an original disk or a copy?|
If it's a copy, a CD-R or DVD-R (if the drive can read DVDs) should work fine but other types of burned disks may not read properly in a drive they were not made in.
Clean the CD if it needs it.
Use a laser lens cleaning CD in the drive, or on a laptop you can usually clean the laser lens easily with a cloth or tissue when the tray is ejected and there's no CD in it.
If that doesn't help....
- if it's a burned CD, you may need to make a CD-R or DVD-R copy of it in the drive it was burned in, or in a burner drive that can read it fine, and use that with the laptop
Minor errors reading the ram can cause errors reading from CDs or DVDs
If you HAVE NOT changed which ram you have installed....
A common thing that can happen with ram, even ram that worked fine previously, is the ram has, or has developed, a poor connection in it's slot(s).
This usually happens a long time after the ram was installed, but it can happen with new ram, or after moving the computer case from one place to another, and I've had even new modules that needed to have their contacts cleaned.
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
For a laptop, you must remove both its main battery and AC adapter before you do that.
See the Owner's or User's manual for your model if you need to.
- if you HAVE you changed which ram you have installed in the laptop, you might have the above poor connection problem
, or - not all ram you might think is compatible with your laptop is compatible with it - in some cases you get small amounts of ram errors when ram that isn't 100% comptible is installed
- if you still have the ram that worked fine in the laptop before, try installing ONLY that ram to seeif your problem goes away.
- if you no longer have that ram, then test the ram, or in any case you could test the ram.
If you do a ram test, do that AFTER having tried cleaning the contacts and making sure the ram is seated properly - otherwise any errors found may be FALSE.
If the ram is incompatible with the chipset, or on more recent computers, incompatible with the memory controller built into the cpu, it will likely FAIL a ram test - that is NOT a true indication of the ram being faulty - there is probably nothing wrong with it, and it will pass the test if installed in a mboard it is compatible with.
If a ram test DOES find errors, if you have more than one module installed, try the test with one module at a time - sometimes they won't work properly when more than one is installed, but it will pass when by itself.
If you want to try a memory diagnostic utility that takes a lot less time to run a full pass than memtest86 does, this one is pretty good - Microsoft's
Windows Memory Diagnostic:
It can be toggled (press T) to do a standard or a more comprehensive set of tests - use the default 6 test one first - if it passes one pass of that, use the latter one. A few of the tests in the latter set are intentionally slower.
If you don't have a floppy drive, see the Quick Start Information at that Microsoft link for how to make a bootable CD of the Windows Memory Diagnostic (you need Windiag.iso - you don't necessarily need to use the program they mention to add it to the CD).