Either you increase virtual RAM or you upgrade your RAM.
Increase virtual RAM:
Right click My Computer > Properties
Click on the Advanced tab. Under Performance, click Settings.
Another window will open. Under Virtual Memory, click Change.
Another window will open again. Select the drive where Windows is
installed (by default it's C drive)
Under Paging file size for selected drive, select Custom size.
Enter at least 1024 for Initial size. Maximum size set it to
2048MB.
Click OK all the way to apply the settings.
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Upgrade RAM:
Warranty expires, go any tech shop to upgrade it. Spoil not my
business.
Warranty haven't expire, go IBM authorized service centres.
T41 is using PC2700 RAM. Remember to tell that to the
technician.