I have this seemingly common symptom. Steps I have taken to try and fix it so far: Uninstalling/Reinstalling TI8 with the 937 patch Running chkdsk /f on startup on both drives Making sure TI8 is done analyzing partitions before doing anything when I open it Running TI8's check image tool before trying to mount them Mounting them on under many different letters Not passwording images/passwording them again Defragmenting Stuff that could be important: My C: drive (on which Windows XP is installed) is a Seagate 160GB SATA drive my Secondary drive (I (internal) which I backup and store large files on is a 250GB Maxtor (also SATA). Both are formatted in NTFS, both have enough space to mount a virtual drive. I do have a virus scanner (Kaspersky) and have not tried disabling that while creating images yet, if that would help at all. I am running Windows XP SP2 with all recent microsoft updates. My motherboard is an ASUS SK8V.