1. Click on Start.
2. Click on Control Panel.
3. Click on Performance and Maintenance then System (for Windows 2000, just click System).
4. Click on the Advanced tab
5. Click on the Settings button under the Performance heading.
6. Click on the Advanced tab.
7. Click on the Change button under the Virtual Memory heading.
8. Select Custom size.
9. Set both the Initial size and the Maximum size to 0 (zero).
10. Click on Set.
11. Click on OK until you are prompted to restart. Restart when prompted.
12. After the restart finishes, click on Start.
13. Click on All Programs (just Programs in Windows 2000).
14. Click on Accessories.
15. Click on System Tools.
16. Click on Disk Defragmenter.
17. Click on Defragment. If you receive a message that the drive does not need to be defragmented, choose to defragment anyway.
18. Let this finish. Do not perform any other tasks on the system while the defragment is running. It will take a while.
19. When it is done, it will show you a report. Look for the Total Fragmentation percentage. If it is greater than 5%, click the Defragment button again and let it complete a second time.
20. Continue to defragment the drive until either the Total Fragmentation drops below 5% or the percentage does not lower beyond the current value.
21. Close the Disk Defragmenter window.
22. Click on Start.
23. Click on Control Panel.
24. Click on Performance and Maintenance then System (for Windows 2000, just click System).
25. Click on the Advanced tab
26. Click on the Settings button under the Performance heading.
27. Click on the Advanced tab.
28. Click on the Change button under the Virtual Memory heading.
29. Select Custom size.
30. Set the Initial size to 1024 and the Maximum size to 2048.
31. Click on Set.
32. Click on OK until you are prompted to restart. Restart when prompted.

Windows 98/ME:

1. Right-click on My Computer.
2. Click on Properties.
3. Click on the Performance tab.
4. Click on the Virtual Memory button.
5. Enable Let me specify my own virtual memory settings.
6. Set the Minimum and the Maximum to 0 (zero).
7. Click on OK twice and restart.
8. After the restart finishes, click on Start.
9. Click on Run.
10. Type "defrag" without the quotes and click on OK.
11. Click on OK twice and let the defragment run.
12. After it completes, close the disk defragmenter.
13. Right-click on My Computer.
14. Click on Properties.
15. Click on the Performance tab.
16. Click on the Virtual Memory button.
17. Enable Let me specify my own virtual memory settings.
18. Set the Minimum to 1024 and the Maximum to 2048.
19. Click on OK twice and restart.

Windows Vista:

Please follow the instructions here:

http://windowshelp.microsoft.com/Windows/en-us/help/89ca317f-649d-40a6-8934-e5707ee5c4b81033.mspx

This process will allocate extra hard disk space to act as memory, and will ensure that the memory space is not fragmented. Keep in mind that low virtual memory and low video memory can produce similar errors. Please ensure that your video adapter meets the minimum requirements for the game listed here: Is my video card supported by Lineage II?