I am new to this forum, and this is my first post of any sort on a technical site, not professionally related. I have been using the same XP installation for my Home media server / HTPC for around 5 years, it is currently XP Pro, SP3. Recently I helped my daughter clean her desktop which was riddled with viruses / trojans. Soon after my own machine began behaving strangely...no good deed goes unpunished! Her PC is fine of course.
Anyway I have tried most everything I read on this forum, as well as others to isolate the problem, and the symptoms are strange indeed. The PC boots and operates normally for about 6-8 hours, then starts to kill processes, experience disk errors, and act as though it has run out of memory or handles. After reboot it acts fine for another 6-8 hours then drags to the crawl of death. In Safe mode this behavior does not repeat. I have Symantec AV, ZA firewall, and have run CCCleaner, Combofix, Malwarebytes, Adaware, Kapersky's scanner and Spybot, in sequence both in safe and normal modes. I am not seeing anything show up in the scan results that explains this behavior, but I am not as adept as the experts on this forum. I have also tried limiting all loaded programs / processes to bare minumum, and it still happens. Checking the Event logs, I see disk warnings, then increasing "not enough process memory" errors. Typically just before final oblivion the desktop starts popping up dialog boxes stating ".dll is a bad image", or "not enough storage to process this command". Icons start disappearing and text / icons / start menu becomes unreadable and programs start to shut down. Eventually it just seizes up and requires a hard-boot. I have also run checkdsk on the boot disk and no issues were detected. I hope someone can tell me I don't have to rebuild the HTPC from scratch...
Any help is appreciated.
All the best,