I have the latest Net.Framework installed and I can tell you it's not part of that software. My guess is it's left over from the Trojan you had cleaned out. Run a Registry search and see where it was being referenced.
System Manufacturer/Model Number Assembled in my workshop OS Windows 7 Home Premium CPU Intel Core 2 Duo @ 3.00gHz Motherboard Gigabyte GA-P35-S3G Memory 4 GB Graphics Card ATI Radeon HD 2600 XT Sound Card RME 24/96 Card, Realtek Internal Audio PreSonus FireStudio Monitor(s) Displays Acer 1917 (x2) Screen Resolution 1280 x 1024 on both monitors
Keyboard Macally w/2/USB ports. Mouse Trackman Wheel PSU Rosewill 500-watt Case Rosewill mid-tower Cooling Noctua NH-U9B (CPU), PwrSupply fan + single large case Fan Hard Drives Three 250GB Seagate SATA Barracuda 7200rpm Other Info Event 20/20 bas studio monitors, Yamaha sub.
Rackmount Korg/Roland/Yamaha synthesizers,
Cubase MIDI/audio recording. Sony Soundforge audio/mastering software. CD Architect Mastering. RME & Presonus audio interfaces.