Android gadget cdc driver

I just lost my IMEI of my phone Canvas Spark Q380 (MT6582). I restored it via engineering mode. Now I want to go for a permanent fix of my IMEI. For that purpose, I have downloaded SN Write Station and all required drivers (USB Driver, Vcom driver and Android gadget CDC driver). First 2 drivers are successfully installed on my PC but I'm stuck with the CDC driver. Every time I install that, it says Not enough Storage Available, in fact, I have around 100GB space remaining on my "C:" Disk.
Need your Help! TIA

Using Win7 Ultimate 32 Bit

Attached Thumbnails