Thank you, Essexboy. I think TDSSkiller may have killed this thing. I'm tentatively excited. No warning balloons at all. In Task Manager, the CPU performance matches the percentages in the Processes section, and there are no weird, unexplained spikes. The computer seems to be running normally.
With the logs, I may have made a mistake. I didn't run the report until AFTER the reboot; I've pasted that in below. However, I did take a screenshot of the Scan Results before reboot. It isn't in a file format that will attach to this forum, but I can attach it if needed.
Again, many, many thanks.
13:10:01.0446 3008 TDSS rootkit removing tool 2.8.16.0 Feb 11 2013 18:50:42
13:10:02.0194 3008 ============================================================
13:10:02.0194 3008 Current date / time: 2013/03/29 13:10:02.0194
13:10:02.0194 3008 SystemInfo:
13:10:02.0194 3008
13:10:02.0194 3008 OS Version: 6.1.7600 ServicePack: 0.0
13:10:02.0194 3008 Product type: Workstation
13:10:02.0194 3008 ComputerName: ELIZABETHLAPTOP
13:10:02.0194 3008 UserName: Elizabeth
13:10:02.0194 3008 Windows directory: C:\Windows
13:10:02.0194 3008 System windows directory: C:\Windows
13:10:02.0194 3008 Running under WOW64
13:10:02.0194 3008 Processor architecture: Intel x64
13:10:02.0194 3008 Number of processors: 2
13:10:02.0194 3008 Page size: 0x1000
13:10:02.0194 3008 Boot type: Normal boot
13:10:02.0194 3008 ============================================================
13:10:03.0131 3008 BG loaded
13:10:04.0098 3008 Drive \Device\Harddisk0\DR0 - Size: 0x4A85D56000 (298.09 Gb), SectorSize: 0x200, Cylinders: 0x9801, SectorsPerTrack: 0x3F, TracksPerCylinder: 0xFF, Type 'K0', Flags 0x00000040
13:10:04.0129 3008 ============================================================
13:10:04.0129 3008 \Device\Harddisk0\DR0:
13:10:04.0145 3008 MBR partitions:
13:10:04.0145 3008 \Device\Harddisk0\DR0\Partition1: MBR, Type 0x7, StartLBA 0x800, BlocksNum 0x32000
13:10:04.0145 3008 \Device\Harddisk0\DR0\Partition2: MBR, Type 0x7, StartLBA 0x32800, BlocksNum 0x24FF7800
13:10:04.0145 3008 \Device\Harddisk0\DR0\Partition3: MBR, Type 0xC, StartLBA 0x2502A000, BlocksNum 0x400000
13:10:04.0145 3008 ============================================================
13:10:04.0207 3008 C: <-> \Device\Harddisk0\DR0\Partition2
13:10:04.0238 3008 D: <-> \Device\Harddisk0\DR0\Partition3
13:10:04.0238 3008 ============================================================
13:10:04.0238 3008 Initialize success
13:10:04.0238 3008 ============================================================