I am running Office 97 on an XP SP3 machine with no compelling reason to upgrade Office or Windows. All worked perfectly until I tried upgrading to NOD32 5 and I had the USB HD lockup issue. I downgraded back to NOD32 4 and all was well again. Now, with NOD32 188.8.131.52 claiming to solve the USB HD problem, I went ahead and upgraded. I didn't have a chance to test the USB issue because a new issue arose that needed immediate attention. With NOD32 184.108.40.206, anytime I opened either Word, Excel or Powerpoint and then tried to open a file using File>Open, as soon as the Open dialog box appeared, the Office 97 program would immediately crash. Opening an Office 97 program by double-clicking a document file would launch the respective program just fine. It was just the File>Open command that would crash the program. I have downgraded back to NOD32 4 and all works fine again. 1. Has anybody seen this problem? 2. Any ideas why this happens?