I believe there are compatibility issues with windows 8 and fastboot. If you have an xp machine I would use it. Here is a video on setting up fastboot drivers;
https://www.youtube.com/watch?v=3Os_U8n9ngY
Here is a link to the fastboot drivers;
https://dl.dropboxusercontent.com/u/17300857/Fastboot+ADB(20926).zip
Here is a link to setting up fastboot and flashing instructions;
http://forum.xda-developers.com/wiki/Dell_Streak_7/Flashing_Guide#Installing_a_recovery
Here is a link to a video on using fastboot commands (You should only need to flash recovery.img)
https://www.youtube.com/watch?v=kIkcALvQmWM
Fastboot command to flash recovery image is "fastboot flash recovery recovery.img" (without quotes) hit enter.
After flash has completed "fastboot reboot" hit enter.
Once you have the recovery I sent via pm flashed, reboot your device into recovery mode and install update.pkg (The .pkg file I set you needs to be renamed update.pkg and placed on the sd card.
I haven't owned this device in awhile but did flash multiple roms/recoveries without issue but I'm going from memory here. You might want to use google and research if your not comfortable with flashing .
Good luck!