xp system, encountered such a problem?

Users questions:xp system, have always said that is not enough virtual memory or the memory is not enough, no applications are not open, double-click the application is always prompt an error, open the My Computer properties, suggesting that randll32 wrong, but the system was not always this way, is to use the use of the so! I ask why? How to solve? Thank you Thank you for your answer, you say, I have paid attention to, not those issues, in addition to re-install the system, is there any way else?
Experts answer: solution: 1. The first two reasons to exclude the virus. Increase the virtual memory and memory 3. The use of memory optimization software 4. According to actual machineI feel the occasion of the preparation of operational procedures of the program is perhaps because a change in the system can also be
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