Oh dear...that really stinks....in the future you can use this online free antivirus scanner and it works pretty well. (its always good to run more than just one scan of your computer, no one program can pick up all viruses all the time)

http://housecall.trendmicro.com/ Once the scan is done, they should tell you how to delete the viruses/trojans.

To get to safe mode - To get into the Windows 2000 / XP Safe mode, as the computer is booting press and hold your "F8 Key" which should bring up the "Windows Advanced Options Menu" as shown below. Use your arrow keys to move to "Safe Mode" and press your Enter key.

To do a restore - If Windows XP starts
1. Log on to Windows as Administrator.
2. Click Start, point to All Programs, point to Accessories, point to System Tools, and then click System Restore. System Restore starts.
3. On the Welcome to System Restore page, click Restore my computer to an earlier time (if it is not already selected), and then click Next.
4. On the Select a Restore Point page, click the most recent system checkpoint in the On this list, click a restore point list, and then click Next. A System Restore message may appear that lists configuration changes that System Restore will make. Click OK.
5. On the Confirm Restore Point Selection page, click Next. System Restore restores the previous Windows XP configuration, and then restarts the computer.
6. Log on to the computer as Administrator. The System Restore Restoration Complete page appears.
7. Click OK.

Hope this helps!!