Q: warning SUID file modified after verify disc permissions 10.6.8 - what to do ?

hi

II have had a super slow computer for about 2 weeks mac book pro / 10.6.8

the rainbow wheel is  turning a lot [  even internet  is slow - but speed check says it isn't ]

I moved things off it to make more space

now  499.76 gb / 28.92 gb free

I do a lot f wrintg and images and think I have a lot of files:

?

I just ran Verify permissions  in Disc utilities and  this was  one result listed [ amidst other permissions found awry  I've said 'repair' to - undertaking those now ] :

Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent" has been modified and will not be repaired.

what does this mean = what should I do

* I am barely computer literate  [its workings-wise]...

and too scared to put in the original disc etc.

Also  I just read this on the forum:

....."OS X performs certain maintenance functions that are scheduled to occur on a daily, weekly, or monthly period. The maintenance scripts run in the early AM only if the computer is turned on 24/7 (no sleep.)"

from:

Kappy Tampa, FL and Vancouver, BC

Re: Mac running very Slow and Hot

Sep 2, 2012 1:15 PM (in response to mvcola)

If you don't have any processes consuming a lot of CPU time, then the computer shouldn't be running hot.

and wondering if no sleep has cuased this - because sometime this year I did change to no sleep to sleep after an hour [I think] which I thought would make computer wear less/ last longer   - should I go back to  "no sleep"  ?

thanks for any advice about smooth operation  checkups etc for non computer savvy type  who doesn't want to lose or wreck anything !

Julie