Hi..
Even I have a exactly similar problem and when I tried for the attrib -h shelliconcache ,its saying file not found. I also had a number of entries in the hosts file and RPC (lsass.exe) shutdown error used to appear.but after deleting the host file entries ,the error did not appear.
I am only able to run the programs from the task manager and nothing else.

Please advice on this...its very urgent.