I have a concern with XP restore Machine details: Dell C840 laptop, 1.8 MHz, 1GB ram (recently upgraded from 512 MB) 40 GB HDD. XP Pro SP2 with latest updates, ZAP firewall, Norton 2004 antivirus, sync to iPAQ 1945 using ActiveSync 3.8. I run SpywareGuard, SpywareBlaster, SpyBot S&D and Ad-Aware SE - full scans for viruses and spyware weekly. I have used Wintasks and SpyBot utilities to selectively limit the startup list (maximise resources and minimise startup, which takes about 3 min). Broadband internet via BT and an Intel AnyPoint DSL modem. Lots of software loaded (MS Office, MS Project, Lotus SmartSuite, Paintshop Pro, Adobe Acrobat, etc, etc.). I use Firefox 1.5 rather than IE6, except when I have no choice. I have run SpeedUpMyPC and Registry Mechanic to keep load times down and registry clean. Problem is that System Restore occasionally loses the ability to restore back to a previous restore point - switching Restore off and then on again on fixes this (which I check by creating a restore point then going back to it 10 mins later, then undoing that restore) but then it seems to fail a few days/weeks later. It's a concern as I can't rely on being able to restore my way out of any problems I might get. Anyone any idea what could be corrupting the restore files? I have heard that the restore files are cumulative, and that if one old file gets corrupted, none of the restore points will work. I tried MS Knowledgebase, but with no joy. Advice/fix welcome.