Running an HP Pavilion z4230 laptop with MS XP Home SP2, IE6. Just installed two Kingston 512 meg PC4200 chips a few weeks ago and things have been running fairly well, except for two issues that have been popping up in the past week or so. This first problem also happened before putting the new memory in when it had only 512K. 1. (Not verbatim)... "Virtual Memory was low and Microsoft is making the necessary adjustments...", etc. That happened last Sun and Monday night a few days after putting the new memory in. 2. Just last night we got this: "Qx771b3670 reference memory at Ox73bd01d4. The memory could not be read at IExplore.exe." In the past 24 hours I've run multiple CrapCleaner scans, including the Registry scan, a Malwarebytes Anti-Malware full scan, and a full AVG scan. Nothing nasty was found other than a tracking cookie and the "normal" stuff. Just ran Belarc Advisor and both of the new chips are read/ID'd, for what it's worth. Just after lunch today a little pop up box showed itself with this: "Stack Overflow at Line 198". Does all this relate to a registry corruption, even though CCleaner isn't showing any particular issues with it? Any idea what's going on here, and what should I do next? As info, for the most part, only Outlook 2003 and IE6 have been run, with 'Facebook' being the primary web site being perused by my wife. Thanks!