NIS 2010 to 2011 Question

Recently we upgraded one of our computers from NIS 2010 to 2011.  The others will be done later, depending on how we like it.

 

Today I was doing some maintenance on the upgraded (NIS 2011, 18.1.0.37) computer (XP Pro + SP3).

 

I discovered that the D&S/All Users/Application Data/Norton folder is 287 MB!   It previously (last month) had almost no size.

 

Under that current Norton folder are 3 folders, but one folder has all the 287 MB:  {0C55C096-...}

 

Under the {0c55C096... folder are 3 folders, but one folder has _all_ the 287 MB:  NIS_18.1.0.37.

 

That 287 MB in All Users/App Data is in addition to:
PF/Norton Internet Security  (72 MB)
PF/NortonInstaller  (10 MB)

 

Q1:  Is the All Users/App Data/Norton 287 MB folder still needed?

 

Q2:  If the answer is yes, _why_ is it necessary, since there is a PF/NIS folder (where programs are supposed to run from)?

 

Q3:  If the answer is no, why would Symantec leave so much unused crap lying around after an install/upgrade?

 

Q4:  Why is there a PF/NortonInstaller folder, since the upgrade was completed days ago and the computer restarted many times?