Cant access https sites - NIS at fault?

Hi, i was messing around trying to speed up my machine and stupidly edited my registry without backing it up.

 

so i removed most of the keys from the run keys in the HKLM and HKCU part of the registry .. bad move

 

some of them were obviously needed because all of a sudden I cant access any HTTPS sites at all

"page cannot be displayed"

 

so .. i tried to remove NIS completely, but its all gone a bit wrong.

now , when i open ics, i get the beginning splash screen, upt every section says attention, and i cant click anything, and it says i dont have permission when i click on the settings.

 

can someone help please this is driving me mad

 

os = xp pro sp2

 

Advance thanks