When browsing e bay my screen keeps scrolling down in a jolty fashion. Also an ad on every page i open. Can anyone help?

After downloading yosemite, i am now experiencing constant screen scroll when browsing e bay. Also now i have adverts galore. Anyone help?

To RCCHARLES: THANKS !!!!  I did the safe boot start, following the link you provided, then waited, and waited, and waited, and ---
Well that is interesting. Amoung other things safe boot does:
-- check and fixes up your file system.  The files system allows you to keep files on your harddrive.
-- Does all video rendering in software.
You could have a one time glitch or harddrive is slowly failing.  If you never replaced the harddrive, it is time for a new one.
You may want to consider getting a new harddrive.  The easiest way is to get an external drive.  No disassembly of the machine is required.
You need an external Firewire drive to boot a PowerPC Mac computer [ a few G5's will boot from USB ].
I recommend you do a google search on any external harddrive you are looking at.
I bought a low cost external drive enclosure. When I started having trouble with it, I did a google search and found a lot of complaints about the drive enclosure. I ended up buying a new drive enclosure. On my second go around, I decided to buy a drive enclosure with a good history of working with Macs. The chip set seems to be the key ingredient. The Oxford line of chips seems to be good. I got the Oxford 911.
I'd give OWC a call. 1-815-338-8685.
FireWire 800 + USB 3, + eSATA
save a little money interface:
FireWire 400 + USB 2.0
This web page lists both external harddrive types. You may need to scroll to the right to see both.
http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/eSATA_FW800_FW400_USB
     (2) FireWire 800/400 Ports (Up to 100MB/s / 50MB/s)
     (1) USB 3.0 Port (Up to 500MB/s / 60MB/s)
     (1) eSATA Port (Up to 300MB/s)
Has a combo firewire 800/400 port.  Not sure what this is.  Looks like you will  need 400 cable.
http://eshop.macsales.com/shop/ministack

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