I have avast free antivirus version 7.0.1456, WinXP (fully updated with service packs).
About 24 hours ago I went to do my nightly scan and the scan didn't scan any files. It just finished within a second and reported no files scanned and no threats found. I'm 95% sure I didn't do anything unusual or go to any weird sites between my last successful scan (about 36 hours ago) and now. I tried tinkering with the scan settings and making a custom scan, but again the scan didn't scan any files. I did look at the scan settings before trying the initial scan that failed, but I didn't change anything, and now I'm kind of stumped.
Any ideas about how to fix this?