I am posting here because I saw another Returnil thread redirected to here by the moderator. Yesterday, I installed Returnil Virtual Session 2008 Personal Edition version 18.104.22.16811. I used it for 6 or 7 hours before shutting down the computer for the night. Problem 1: As a test of the virtuosity of my system partition (C: ), I saved an email attachment from web based (Yahoo) email with Session Lock enabled. Using the file browser to locate the save point, I clicked on C: in the dropdown list box. I immediately received a blue screen with the system halted. I have not had the BSOD with Vista (new Acer laptop) since I started using it last September ... heavily every day. I repeatedly tried to reproduce the problem, but I could not. I was able to save file to various locations in the C partition. On reboot, they were satisfyingly gone. Problem 2: The next morning I started the computer with System Protection enabled in RVS preferences. Everything seemed ok until I clicked on the shortcut on the QuickLaunch bar for the OpenOffice wordprocessor. The executable was not found. On stepping through Program Files to the program folder within the OOo folder, I encountered a message saying that the folder was corrupted and inaccessible. No disc corruption has happened with this laptop before this point. Chkdsk found and fixed a problem with $I30 index for file 5630. It also quickly listed dozens of orphaned files. I do not know what is meant by orphaned unless it's that they have incomplete index entries. After these repairs, the OOo shortcut resumed working. Note that there was a quick succession of severe power fluctuations due to a storm a few hours after installing RVS and with Session Lock active. The power went off 2 or 3 times in quick succession ... long enough to cause my LCD monitor to go black. The laptop, fully charged, did not show any obvious problems. I continued without booting and without apparent problems for several hours more until shutting down for the night. Shutdown was normal. Startup the next morning was normal. System: Model: Aspire 5610Z BL50, Intel Core Duo T2080 at 1.73 gHz, 2 gig RAM, 160 gig Harddisk, Vista Home Premium fully up-to-date. I am now very nervous about using RVS. No other posts that I have found seem to describe exactly what I have experiend. I have searched within Wilders Forum and on the internet in general. Any advice will be appreciated.