Problem uploading sketches to the board

I recently downloaded the Arduino software and tried running a code to blink the internal LED on the pin 13 of an Arduino Uno but I got errors reading that Invalid Library was found in my C drive.

I tried googling everything I could but since I am a beginner, I didn't really understand half the technical searches that were returned. I am attaching my code here which is filled with errors hoping someone would help me out. Thanks in advance.

Arduino: 1.6.9 (Windows 10), Board: "Arduino/Genuino Uno"

Sketch uses 1,104 bytes (3%) of program storage space. Maximum is 32,256 bytes.
Global variables use 11 bytes (0%) of dynamic memory, leaving 2,037 bytes for local variables. Maximum is 2,048 bytes.
http://downloads.arduino.cc/packages/package_index.json file signature verification failed. File ignored.
Invalid library found in C:\Users\Anirudh Kishore\Documents\Arduino\libraries\sketch_jun11a: C:\Users\Anirudh Kishore\Documents\Arduino\libraries\sketch_jun11a
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x7c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x7c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x7c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x7c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x7c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x7c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x7c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x7c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x7c
avrdude: ser_send(): write error: sorry no info avail
Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
Invalid library found in C:\Users\Anirudh Kishore\Documents\Arduino\libraries\sketch_jun11a: C:\Users\Anirudh Kishore\Documents\Arduino\libraries\sketch_jun11a
Invalid library found in C:\Users\Anirudh Kishore\Documents\Arduino\libraries\sketch_jun11a: C:\Users\Anirudh Kishore\Documents\Arduino\libraries\sketch_jun11a

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Are you sure that the Arduino is recognized by Windows?

Yup. I went through the troubleshooting options on the arduino website to find out that I've got no problems regarding the board being recognized as Arduino Uno or it appearing on the serial port.

And where did you get your sketch? The IDE comes with examples already.

So I resolved the issue regarding the invalid library. I realized my sketchbook folder was in the library because of which that error occurred.

Then I tried running the example 'Blink' and the uploading process starts but doesn't get terminated.

With the bar still reading 'Uploading', this is what I receive on the black box at the bottom.

Sketch uses 1,066 bytes (3%) of program storage space. Maximum is 32,256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes for local variables. Maximum is 2,048 bytes.
http://downloads.arduino.cc/packages/package_index.json file signature verification failed. File ignored.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xf0
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xf0
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xf0
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xf0
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xf0
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xf0
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xf0
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xf0
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xf0
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xf0

I have no idea what you are doing. Perhaps it is something unusual with Windows 10. There should be nothing to with libraries to just blink a LED.

Do you think it’s possible for you to explain to me what this might mean at least? This is the first error message that pops up.

http://downloads.arduino.cc/packages/package_index.json file signature verification failed. File ignored.’

Thanks a ton for responding at the first place.