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Max Memory on IBM Lenovo T61

I have an IBM T61.  It currently has 2 gigs of RAM.   Can I expand this to 4 gigs?   The computer tends to slow down in certain cases.  (I've enclosed a screenshot of processes.)  Most notably, I have a 128 MB  searchable pdf file that kind of "drags" when you scroll down.   It's 376 pages, but I feel that this shouldn't represent too much of a problem.   Is the issue the CPU?  Or would more RAM help at all?   Maybe I need to turn off iexplore.....

Anyway, I hope this all makes sense.
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I went to Control Panel and clicked on system.  Screenshot is below.    Few questions:
1) Do I have 32 bit... ?
2) Should I download SP3?
3)  It looks like I have two one-gig sticks of mem.    From what I can tell, 32 bit XP only allows 3 gigs.   Can I get faster memory?  If so, what's the max?   Most important, will one extra gig of faster memory give me any noticable improvement?
4) Is there anything that might be slowing down teh CPU (other than obvious things like IE Explorer, etc.)
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Thanks, Meko.   I've downloaded and used these and similar programs.   I'm not sure if it's any of the ones you listed, but in the past, I've found that they cause as many problems as they fix.

Also, should I download SP3?   Do they update SP3?  Or is the one I have on CDR sufficient?
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Ok..  Meko, I downloaded and ran all three programs.   The PDF file I mentioned that is 376 pages seems to be running a bit faster.  Thanks!

In running ComboFix, the program said I need to disable Norton Int. Sec.   Do I do this via MSconfig?  If so, should I just disable anything with "Sym" or "Symantic"?     I've never heard many praises for Norton.  Should I just remove it altogether?

I know this would be a bit tedious, but would it be helpful if I just posted a few screenshots of MSconfig/startup?   If so, I'll begin another question.  

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Alright.   Here's what I did:
1) I ordered two 2-gig sticks of memory.  So I'm guessing that will improve speed in some applications by 5-10%, right?
2) I got rid of Norton;
3) I loaded MSE and MBAM.  Those will be my two primary tools.
4) I'll post another question re: MSCONFIG.  I'd like to eliminate any unnecessary programs.

Thank you!!!
I ended up upgrading to 4 gig.  There's some difference, but not tons.