Centrum semiovale white matter disease

I have been having some serious memory problems and problems processing information. My neurologist sent me for an MRI of the brain.  He also did an EMG and nerve conduction study on both legs because of extreme weakness and pain.  I can't walk more than 20 steps without pausing and trying to do anything normal anymore is difficult or just not possible.  Anyway, there are more issues than I feel like typing right now.  The MRI shows centrum semiovale white matter disease.  Although I was worried that I might have MS, he said that there is no evidence of MS or anything like that.  I have spent the last hour googling this and there is so much nebulous scientific info that is doing nothing but confusing me.  Can anyone tell me what this is?  He also said I have moderate neuropathy in both legs.  What does all this mean?
Thanks so much if you can help clear this up for me.
Mia