Advice needed please. I have nearly 2 gigabytes worth of duplicate files on my laptop. As my harddrive is only 20 gigs this is a large portion of my drive. Can I delete files in the following two folders?

C:\WINDOWS\$NtServicePackUninstall$\

C:\WINDOWS\$NtUninstallKB911565$\

There are copies and duplicates in these two folders but I will leave them alone for now.

C:\WINDOWS\ServicePackFiles\i386\

C:\WINDOWS\System32\

Most of the duplicates seem to be the result of updates.