ppsspp problems

[DanGer]

in the last few weeks i open the game and its back to normal no more blue things that blocks the texts but after a day when i open the game again the problem is back again.......yeah maybe i think my laptop is old now because it is 4yrs old and have some problems in it

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ppsspp settings:
[renderingmode]
mode : buffered rendering
simulate block transfer: check
[performance]
rendering resolution|check|
vsync |check|
hardware transform|check|
software skinning |check|
vertex cache |check|
spline/bezier curves quality : medium

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laptop specs:
OS: windows vista home premium
Processor: intel core 2 duo cpu t5850 @ 2.16ghz 2.17ghz
RAM: 3gb ram
system type: 32bit operating system
Video adapter: ATI mobility radeon HD 3470
Video memory: 256mb