PC continued to work properly using my old card.
Last night I installed an update for Messenger Live.
PC worked as normal after the install.
I use Avira Premium AV and did run my weekly scan, including looking for rootkits, late last night. Nothing found.
PC this morning would not run. I got a blue screen with the message that 'fssfltr_tdi.sys' was a fault that was causing me the problem.
I can't find anything online that I understand.
Fortunately I have Shadow Protect Desktop Imaging software on my pc and was able to revert to a clean image and am now running ok.
Can anybody tell me what happened?