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The possibility of a PPC virus is so remote I doubt you need to be concerned about it. In fact, the most likely candidate would have asked you if it could be installed, so you would know if you had it.
First, how many apps are running? The 'X' button on the app windows does not close them, it simply sends them to the background. To close apps, you need to get a utility like Magic Button that adds close function to the 'X' button, or go to Settings/Memory/Running Programs to close any you don't need running and free some RAM.
If you browse the net or use AvantGo, another likely issue is that your space has been claimed for cache and temp files. If you can connect to a sync session, you can use your desktop Explorer to browse your device to find the folders of the cache and temp files and empty them. An app like MemMaid or Space Reclaimer can run at start-up (as well as manually at any time) to help keep the buildup in RAM of these surplus files under control.
See if these steps help you reclaim some RAM.
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