Boot time scan problem

Avast Free Antivirus / Premium Security
1

After finish scanning, it told me to schedule boot time scan
When i restart suddenly a crash occur.
Its already to times
Any ideas on this problem??
My computer :
Time of this report: 7/28/2012, 09:30:08

Computer : Compaq Presario CQ3202L Desktop PC
OS : Windows 7 Starter 32-bit (6.1, Build 7600)
Processor: AMD Athlon™ II X2 245 Processor (2 CPUs), ~2.9GHz
Memory: 3072MB RAM

2

On the scan within avast did it pick up infected files?? before you did a boot time scan. Can you access safe mode in windows 7. HIT F8 AS THE COMPUTER IS STARTING. And work from there. Select safe mode with networking.
Download malware bytes free and update it and run a scan etc.