...firstly deletes two registry keys - these are the lines that start with 'del'
Then it stops a service - then renames the file catroot2 as oldcatroot2
Then it restarts the service
Then it uninstalls and reinstalls a series of dll files
Then it changes the attributes of a few files.
Now, this may be because some spyware has been on your machine - or it may be an attempt at removing same.
Am not certain, but if the machine is working fine simply get a good anti spyware prog i.e. ad-aware and run it.
Keep in mind 'if it ain't broke, don't fix it!'