Root Cause Found: Registry Is Corrupted

I have a HP mini, microsoft 2005 pretty sure its a Windows 7.Basically I pulled the battery out by accident at a bad time. I had left the laptop on all night. It has always been slow but when I opened it it was very very slow. I saw a sign from AVG, with a window box saying AVGDIUX.. an error message. I made a mistake and pulled out the battery.Now when I switch it on it only goes to a start up repair screen. It runs a check for problems, tells me it cannot fix it automatically and then offers to shut down the computer. Scan results are:

Number of repair attempts: 5
Session details
System Disk = DeviceHarddisk0
Windows directory = D:Windows
AutoChk Run = 0
Number of root causes = 1

[code]....

I switched it off and pressed F8 repeatedly at start up. I can get to the F8 screen with the different options. I tried to go to safe mode/safe mode with command prompts but automatically goes to the start up repair screen and then goes through the same process i.e. saying it is doing a check and then that it can`t fix it etc.