i want to upgrade my IBM Laptop, here the spec:
         Pentium III 450Mhz
         128MB SDRAM
         10G Hard Disk
         OS Windows XP.
   the internet speed, 384kbps, when im using webcam to webcam calls slow motion image and SOMETIMES its hung up. anybody can help me?what series do you have?  Pentium III 450Mhz  (model?)

really the only thing you might try is more (INCREASE) the memory... laptops are so expensive to PAY someone to work on, your better off buying another or a nice desktop.im using IBM Thinkpad R390X 2626I did a little checking on that model, kinda hard to get info on....then came ACROSS this specific page for parts and possible upgrades... Check it out and  get an idea what I mean on the costs to improvement  ratio

http://www.impactcomputers.com/ibmparts-ibm-thinkpad-thinkpad-390-parts-ibm-thinkpad-390x-2626--15-1-tft--parts.htmlWell, solving your memory problem will probably help with this.  Also, is your Internet speed actually close to 384Kbps or somewhat less?  That can affect webcam use.Agree with soybean, your computer is memory-starved.
I've never tried to run XP on 128MB, but it must be painfully slow.

You have two memory slots (sockets) on your laptop, and they will hold a max of 256MB each for a total of 512MB.
I would aquire a pair of 256MB modules and retire/sell the single 128MB.

For a computer of that vintage try to find some used memory, rather than paying the HIGH price of new.
Here is a link to the specifications that your new memory will need to comply with. There are (3) letters at the end of your model that I guessed at, so please verify that from within the link :
http://www.18004memory.com/result.asp?modelID=13352&mfgID=46&pclass=0

As a price comparison, here in the States that memory (256MB PC100 SODIMM) sells for a $20USD used and you can see that it is $75USD new here in this link.