The Cruzer Micro flash drive either uses a proprietary operating system to function and load its set of utilities that include encryption, etc. or it doesn't... most of them do. Without this intact you drive won't function and be recognized. The Operating System is called U3.Select this link
to download the San Disk format, read/write check utility for your flash drive. It will also report back the need or not for the U3 Launch Pad (to be recognized and run in Windows).
Once you have run the utility and it has offered to format your drive from scratch again, if need be, to get it working as it was, and you've been told the drive supports or requires the U3 Launch Pad select this link
to reach the download page and choose between the Titanium or Titanium Plus, download install the appropriate U3 Launch Pad operating system.
As you may already know, your flash drive and all San Disk products have a five year warranty. For what these drives cost today the postage alone to send it in would come awful close to the purchase price of another one. But, the choice is yours.
Me, I'm looking at the Cruzer Voyager 8GB to replace my 2GB drive as the Voyager is shock proof and water proof and has been field tested for several months now. Its available at NewEgg.com here
for half the price as when it first came out. Its selling for $59.99 and there is a $20 mail in rebate that makes the final cost even sweeter.
I hope all of the above information gets you going again and has fixed your problem. Please don't forget to rate this as fixed. I'd get your 1GB drive straightened with my solutions and then get an 8GB Voyager at some point.