No buffer space is available

Hi, I have problem with my Win2000 machine - P4 3 GHz, 1 GB RAM. After few hours of work I start to get "No buffer space is available" errors from various programs - Firefox, MS Access (connecting to Sybase database via TCP/IP), Java aplications etc.
I seems to me like the problem has started when I tried to minimize swap file usage after I have upgraded RAM from 512 MB to 1 GB. I have set swap file size to minimum (as I usually use far less memory than 1 GB) and the problem with "No buffer space is available" started to occure. I have increased swap size, but it didn't help.
I have checked for Serflog virus mentioned in Q_21648906 but didn't find it in my PC.

Any ideas before I do reinstall ?
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Jan FranekAsked:
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GranModConnect With a Mentor Commented:
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Irwin SantosComputer Integration SpecialistCommented:
remove that added RAM, as it is a suspect in the problem that you have.. when you do, is the experience the same?
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Jan FranekAuthor Commented:
How can added RAM cause such behaviour ? Machine is stable, just this problem with buffers occurs.
It seems to me like some internal system memory for these buffers was decreased when I minimizes swap size and didn't come back to normal after restoring swap size to normal.
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Irwin SantosComputer Integration SpecialistCommented:
well.that's what we're attempting to figure out... did you apply my comment?
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bkdalrympleCommented:
Check your Swap file and make it 1.5 times your total RAM
Check your registry size as well, insure that it is not listing an abnormal number

Any information from Task Manager as to what is using up your memory?
Are you doing programming on system and have you recently written any programs or scripts that you have running?
Does the problem present if you run in Safe Mode?
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Jan FranekAuthor Commented:
I did try to remove added RAM but it didn't help.

But I have solved my problem - my machine was scheduled for upgrade, I got new motherboard with embedded network card, so I had to install new drivers for motherboard and network and the problem has disappeared. I guess that reinstallation of network driver was crucial, because problem was clearly related to network communication.
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