Try Safe Mode with Networking.
Reboot and when you see the maker's logo, hear a beep or it mention F8, start tapping the F8 key slowly. Keep tapping until you see the safe mode menu. Select Safe Mode with Networking. Log in with your usual login. Make sure you do not have a malware proxy: In IE, Tools, Internet Options, Connections, LAN Settings, then uncheck all boxes and OK. Close IE and restart IE.
In FireFox, Tools, Options, Advanced, Settings, check No Proxy then OK. Close Firefox and restart Firefox.
In Chrome, Wrench, Options, Under the Hood, Change Proxy Settings, uncheck all boxes, OK.
Also change to a known good DNS:
1. Click "Start," click "Control Panel," click "Network and Internet Connections," and then click "Network Connections."
2. Right-click the network connection that you want to configure (the one you use to connect to the Internet), and then click Properties.
3. On the General tab (for a local area connection), or the Networking tab (for all other connections), click "Internet Protocol (TCP/IP)", and then click "Properties."
4. Click "Use the following DNS server addresses," and then type 126.96.36.199 in the Preferred DNS server and 188.8.131.52 in the Alternate DNS server boxes.
5. Click "OK"
Disconnect your network connection, wait 10 seconds and reconnect it.
Then download otl.com from one of these links:
and try to run it. If otl.com doesn't want to work then try otl.scr